I have to totally disagree with several recommendations here.
First, do NOT start hand feeding or holding out pieces of this or that or trying lots of different things to tempt this puppy!
I cannot emphasise the disaster this may cause for LONG TERM eating problems.
Second, do NOT leave kibble out all the time -- this is setting her up to continue NOT to eat within reasonable times, and makes it extremely difficult to tell if she has eaten at all, or how much. And again, it setting your dog up to be a lifelong problem eater. Vets do not advise leaving food down on the floor to let dogs free feed. With this breed, which is prone to over eating it is especially unwise.
Here are two things you need to do:
1) If you have not recently done so IMMEDIATELY get this puppy to a vet and make sure here are no medical reasons this puppy is not eating.
2) Assuming there are no medical issues: learn not to worry about what she is eating and IGNORE her, feeding her with total indifference and without watching and fussing over her, giving her only 15 minutes to eat, at which point, and without comment or fussing, simply lift the food and put it away til the next scheduled mealtime, NO treats in between at all. I would feed what the breeder was feeding and stop worrying. The breeder's food is a good one and if this is what she was eating only days ago it wis what she will eat quite happily once she gets a chance to settle into her new house and she also learns that holding out does NOT bring the rewards you are currently offering her -- fussing, extra attention, hand feeding, all sorts of new things to eat. Or to put it another way -- if you were caring for a three year old who refused to eat your healthy lunch would you instead sart cajoling and fussing and cooking the child meal after meal to see if they will eat? Of course you wouldn't :lol:, because a child then only learns that eating nothing brings tons of interesting attention and additional types of food and is a self-perpetuating reward for unwanted behaviour, and is highly manipulative.
It is exactly the same with a dog. Playing into the dog's demands means you will have problems that persist for years and years. Setting them up to learn this as a puppy makes it especially hard to reverse. This can then become a matter of life or death for an ill hospitalised dog that will not eat! There are so many reasons never to allow this to develop into a problem but stopping it requires your will power, not doing anything to lure the puppy into eating.
Please have a careful read of this page from a cavalier breeder with decades of experience:
http://roycroftcavaliers.com/manualfeeding.htm
From which:
FEEDING DIRECTIONS
Whether you decide to feed a high quality kibble or a commercially prepared whole foods diet, the following directions will apply.
Puppies between 8 and 16 weeks of age do quite well on 3 meals a day. They start out with about a large handful of kibble for each meal or about 1/4 cup. At about 4 to 6 months of age you may begin feeding your puppy twice a day, about 1/2 cup or so each time. Somewhere between 10 and 18 months of age you may begin feeding just once a day--with some really good eaters you may need to feed just once a day by 6 or 7 months of age.
Each time you feed your puppy, put the food down for approximately 15 minutes. If the puppy hasn't finished it after 15 minutes, pick it up and put it away until the next feeding time. Do NOT try to feed in between. Refrigerate if you are feeding a commercially prepared whole foods diet. Do not worry if your puppy appears thin. Puppies are just like humans. Some are very thin while growing up and some are not. It is highly unlikely your puppy will starve itself unless it is already ill. A puppy that grows slowly is best--there is no first prize for gaining full size as early as possible! Puppies who grow slowly are more likely to be able to develop muscle and tissue at the correct rate to keep up the the bone development. Of course some puppies are gluttons! Be careful not to overfeed a glutton.
Also please read:
http://board.cavaliertalk.com/showthread.php?t=24168
In summary: do NOT hand feed, do NOT fuss over her eating habits, do NOT leave food down for more than 15 minutes at a single meal and do NOT then try to feed treats in between meals, and do NOT start to try all different types of food. It is very important at this age to get her eating regularly what YOU choose to feed. Most dogs are pretty indifferent to what they are fed -- having 4 of my own, and placed about a hundred cavaliers into foster places and new homes, I can say with absolute confidence of experience that in 99.9% of cases the only reason they are kicking up a fuss and not eating is because they quickly have learned their owners will immediately start to give them loads of extra attention. And for adult dogs it makes NO DIFFERENCE with a healthy dog if they eat daily or not. Their stomachs are designed for them to not eat for gaps in the wild. Puppies generally will not hold out more than a day or two and almost no puppy unless seriously ill will starve itself. It will simply give in and start eating properly.