sarby, is she a deep sleeper? because if she is there is no point getting stressed about it or even bothering much - it is almost impossible to wake them and when you do get them out of bed to potty or loo they are basically weeing in their sleep anyway - just not in bed.
if she is, you could try to increase her functional bladder capacity to help get her through the night dry; if every time she wants to wee during the day you can get her to practice holding on a few more minutes, her bladder will hold more and the signal to wee will come a bit later. hard to do with such a little one but maybe worth trying?
the sleep pattern also makes a difference - hands up anyone who's ever dreamt they were on the loo when they needed to go....and woken up just in time, if they were lucky, or slightly too late if they weren't???
if you cut late drinks right out it concentrates the urine and that also makes them more likely to go sooner, so while you could cut down a bit it probably wouldn't make much difference.
if she's not a terribly deep sleeper you do have a better chance, but if she's not ready developmentally you really can't do anything at this age; the bedwetting aids like buzzers aren't really meant to be used before 6-7. try not to get cross - she's asleep - she can't help it. (i am speaking from loooong experience of this!)
are you mostly bothered about it because you think she should be dry at night now? if so, then again, there really isn't any point getting stressed, it will only upset both of you...i have 4 kids and they have all been dry at different ages and stages, when they were ready, not when i was.
try leaving it until she's a bit older and then have a casual chat with her about it?