Answer:
Cute bunny :)
So I know that domestics are weaned off milk at about 6 weeks, so she could still be drinking, but she also could be weaning. HOWEVER, they should never loose wait during the weaning process. I would try to give her a formula (baby rabbits should be fed Kitten Milk Replacer (KMR) or goat milk, which you can buy at pet stores, or sometimes even a local veterinarian's office. Because rabbit milk is the most caloric of all mammals, we add in one tablespoon of 100% heavy whipping cream (no sugar) to each can of KMR.) and force feed it to her.
If you are not comfortable with that, you can try soaking rabbit pellets in the formula and mashing up, but there's a good chance she won't recognize that as food.
Maybe join some rabbit keeper forums or ask a local breeder for more help.