My daughter daytime potty trained at 2 (she led it) but was a nighttime pee-er. . .had to change and double up diapers at night because she would go so much.. .so after daytime training was done, started taking her potty before I went to bed, as you are doing. . .not much, diapers still worn at night but she didn't pee as much now overnight.
All of a sudden one day she said she wanted to wear panties, probably around 3 or 3 1/2 yrs old. We went ahead and let her do it. Since she was the one who wanted to do it. She was dry the first two nights, but third night had an accident. Fourth night accident. So what I did was set up a chart by her bed. . .(scratch piece of paper and some random stickers I had laying around) labelled it as stayed dry all night. I told her that we were going to see if she could keep her pull ups dry for three nights, thus three stickers, then she could wear panties again. If an accident occurred, then back to pull ups for 3 days and when 3 stickers then back to panties. We only had to do a couple of rounds of going back to pull ups.
Might be worth a try. I think if your daughter is wanting it, I would acknowledge her desire and try it out, but you shouldn't have to be the one getting up every night to change the bed. The chart beside the bed was such a nice visual for my daughter. . .
Also, for my daughter it didn't matter how long it was since the last drink, she was still holding it all for the night.
Good luck.
E.