Ditto Carrie W.
"Night time dryness" is a SEPARATE thing from daytime potty training. Night time dryness, does not happen until even 7 years old. BIOLOGICALLY based. And per Pediatricians.
My daughter, was still wearing night time diapers (not pull-ups, Pull-ups are useless, more expensive, and leaks), until she was already 5 years old.
My girl is 7 now... and once in a blue moon will still have a night time accident. It is not big deal.
I simply use waterproof bed pads, directly under her. It makes clean up much easier, and i have 4 of them, and I just change them out and wash it if soiled.
Even Preschool and Kindergarten and 1st graders, will have accidents at night. If that puts it in perspective for you. My daughter's Teachers, have ALL said, this is normal as well.
My son is 3.5 years old, and he is still wet at naps and during the night. No biggie.
I do not punish or withhold things or lecture my kids about accidents. It is their body.
Do not limit fluids... just to limit her peeing. That does not do anything nor teach them anything. Because night-time dryness, is biological based. It depends on their brain/nerve development/bladder connections.
Her Doctor saying she is drinking too much milk rather than food, is an entirely DIFFERENT issue. Don't tie it into, pottying.
Potty 'training' does not occur, successfully, unless the child is 'ready.' Also, don't wake her at night just to go pee... that is not helpful either. It just makes them have lack of sleep... and that is worse.
all the best,