Crysania,
If you are close enough to your friend to stay with her for 2 weeks on vacation, you must be close enough to explain your wol and eatting plan. When I visit friends and family, I explain the way I eat and tell them they don't have to change for me, but that I may not eat everything they do. I even take a giant cooler to my Mom's house to keep her from the game of you are so fat, eat this pie I made you - it's your favorite. I also treat any foods that aren't low carb as if I am alergic to them. If you had a friend that would have to be rushed to the hospital if they ate seafood, would you serve them seafood? No, and most people can understand that. Good luck and pack lots of LC bars & treats! Hope you have a wonderful vacation and maintain where you are.
Marie