Teenagers are very, very tough, and each is unique, so what works for one will often fail for another. You’ve also probably tried so many things already that most suggestions here are likely to duplicate those. That being said, here are a couple of things that come to mind:
- In her travels through the health care system has she run into a caregiver that she deeply trusts? A visit/conversation with someone like that might make a real difference.
- She must be numb to the “joys” of hospital care at this point, just to survive. This is very vague, but anything that helps her be more awake/present in her life is likely to be beneficial. Some possibilities that come to mind are meditation, mindfulness exercises, yoga, etc. The “right” choice here is whatever intrigues her rather than the efficacy of the method itself.
- Was she on dialysis before the transplant? A good look at the dialysis “lifestyle” might be motivating.
- There are some very cool water bottles out there (I just saw a few at the Aquarium gift shop). If it seems like a desirable accessory rather than a medical device it might be more likely to be carried/used.
- Sipping throughout the day will work best, if water can be kept accessible and welcome.
- You don’t say whether extra carbohydrates would be good or bad for her from a health point of view. If more sugar would be fine for her then there are ways to make fluid very desirable (as Coca-Cola has discovered). Whether it’s exotic fruit juices or lemonade doesn’t matter very much. There are folks here who believe sugar is the devil (I don’t share this view), but for most of us dehydration is much worse.
- Once you gave her your kidney it became hers. You must, I think, revoke any claim on it. It was a gift beyond measure, but you gave it to a child (for all the right reasons). Sometimes children break precious things.
Good luck! I raised two girls and I’m pretty sure they didn’t hear a word I said while they were teenagers.