You will definitely have to have someone in during the day for that week at least once daily to let her out -- she is just too young to be left for huge stretches like this or you could easily end up with a problem dog with severe separation anxiety. There are things you can do (see end of post). Sep. anxiety is THE key reason why this breed does get handed in to rescue (the *number one* reason I get surrendered cavaliers from owners! The boredom and anxiety frequently starts to lead to barking, accidents and destructiveness because the dog is increasingly distressed. They are a breed that really, really need either people at home on and off, or some sort of daytime relief from a wakler and a good interesting environment to stay at home in [eg the things you are doing like kongs], or a dog companion (it doesn't have to be a cavalier or course). At the same tine you don;t want to be accidentally enouraging her dependence; that's why they need gradual training to learn to have some degree of independence and to be left alone. And owners need to learn what to ignore and how to structure such training.
She WILL drive the neighbours crazy if her needs are not cared for -- this is one of the issues of course of having a dog, and especially a more people-dependent breed like a cavalier; they are not like cats who are quiet and tolerate a working home more easily. They are social animals and total isolation for long days can very quickly introduce social and behaviour problems that in turn can cause complaints from neighbours who in turn may take those complaints to dog wardens who do have the right to remove a dog considered a nuisance.
I'd strongly recommend working on all the issues of separation anxiety and training around this, get this dog into regular daycare or have a hired person take her out daily when you cannot be there, or consider a second dog. I know you outlined some things you are doing, but it has to be the daily norm; this plan really needs to be in place before you have the week of solid work much as you'd make arrangements around a young child.
Maybe that is all done and I am just misunderstanding?
I know it is really hard when you love dogs and also must be at work all day, but just as with having a child, accommodation has to be made for this additional responsibility and this almost always will involve some costs.
I have gathered together a range of articles on separation anxiety here that should be of help
:
http://board.cavaliertalk.com/showthread.php?t=14390
To be honest I'd recommend home-boarding a dog for a week or even kennelling her if no one will be able to come in for a full week of worktime. Maybe someone else with a dog would be willing to take her and then trade off with you for care for their dog at a future point?