If only we had a crystal ball.
We've had to leave George with a very competent friend a couple of times, the first time was about 4 weeks after diagnosis and starting lantus and just about when he started to look like he was on the move with his numbers, we gave him a reduction prior to going away so that he would run higher as my friend would not be monitoring him as regularly. only amps +5 pmps and before bed. We also decided, with the help of the folk here on a no shoot number. When we came back we got right back onto his regular dose.
I know this may be more complicated for you to figure out with Lily's recent DKA, but there are very experienced people on this board who will be able to offer some sensible advice I am sure.
A lot can change in the next two weeks, try not to think ahead too much (pot calling kettle black here), the experienced folk here will help you with making a decision that you can feel comfortable with.
You should try to find out prior to boarding her, how often they would be testing her, how will they handle the 12 hour dosing (I had a problem with my regular cattery who wouldn't be able to do the 12hour dosing), will they be willing to feed her the Low carb food you leave. I wouldn't assume anything even though it's vet run cattery. I wrote a set of notes for my friend so that she would have something to refer to.
Sorry no answers there, but you will be able to figure something out