Melanie how old is your dog? Is she still a pup under say 12 month to 18 months?)? If so I have a feeling she has reached the equivalent of adolescence when they can suddenly put two and two together -- eg ring the bell, make the humans come pay attention to me (because of course the bell isn't JUST about going out, she knows it also brings attention from you!) The barking may be another two and two -- gee, if I make a lot of noise I get attention -- **even if it might be scolding, it is still attention**. Anyone with a child will know the latter makes sense to kids too, who don't really care if their behaviour brings a scolding if it btings interaction with you.
Keep in mind that if this is a very sudden change, there is ALSO a chance that she is not well -- and is using all these behaviours to try and tell you that.
But overall I'd say more likely it is simply behavioural.
As Joanna notes the right way to deal with this is to ignore the behaviour -- REALLY ignore it. Do not meet her eye, do not say anything, go about your business, turn and walk away from her. If she continues, quietly go to her, and pick her up or walk her to a 'time out' room. Do not look or speak to her when you do this. A hall or bathroom works well for this, or an unusued room. DON'T use her crate if you are crate training as you don't want her to associate anything negative with her crate). A time out functions just as it does with a naughty child -- it isn't punishment per se, it is just the removal of all the environmental stimulation -- including YOU -- that triggers this behaviour. Your dog doesn;t want to be without your presence either so this is a good genlte way of saying, if you make all that noise, then the pleasant, normal environment ends. Wait until ahse stops barking completely in her chill out room, then wait another few minutes, then let her out. You can praise her then quietly and give a little treat. The minute the behaviour starts again, once again you quietly spring into action.
I've been at a Dublin seminar with Jan Fennell and have a couple of her books, which I really like in general approach, though I know some would find her dominance theories a bit out of date. However I don;t think this affects the approach at all. Her general advocacy of ignoring -- and that means TOTALLY ignoring -- bad behaviour like jumping up, barking, frantic displays when you arrive home -- does work if you are consistent.
What we often don't realise is that any response to such behaviour reinforces it for the dog. Believe me I know how hard it can be NOT to unintentionally reinforce bad behaviour!! I tend to talk to the dogs generally anyway and am prone to responding to Jaspar -- stop that etc -- when he whines. Of course this is just the wrong approach. Tara and Lisa (Dog Training Ireland) have told me I absolutely must totally ignore Jaspar when he does this exasperating behaviour as they see me in social situations and have noted I am still unintentionally paying attention to him in subtle ways when he starts doing this, especially whining in public, which can be so embarrassing. I am now really working on a mix of time outs and ignoring to try to curb this but it can be a real challenge to change your OWN behaviour in order to change the dog's. That's why trainers say they don;t really train dogs, they train people!! Often it is our behaviour that needs changing, not the dog's. :lol: Unfortunately in Jaspar I have a mix of a dog who has always been very vocal (not a barker but like to 'talk' when playing for example), is very smart and manipulative, and likes lots of mental stimulation. Argh!!
Which brings me to a final point. Have you done obedience with your dog? Obedience classes in a good positive environment works wonders in helping you bond into a better relationship with your dog, and also gives you tools -- asking for responses to various queues -- that can refocus annoying behaviour too, especially in environments like the vets. Teaching them to focus on you gets them to stop focusing on whatever stimulates them into barking and whining. I cannot stress enough the positive benefits of obedience that stretch far, far beyond just teaching your dog to sit and stay. The real benefits are to your dog's socialisation skills with crowds, ability to respond to queues (eg commands) in distracting situations like having other people and dogs around -- which is of course exactly what REAL LIFE is like, not you alone in the living room training your dog in isolation; mix with other dogs, different types of people, and the dog's correct role within your own home. And the pleasure you get from working with your dog. Too often, most of what we say to our dogs is 'NO'! It is great to give them an hour a week in which they hear lots of 'yes!" and get treats for doing the RIGHT thing.