I completely understand what you are going thru. My twins are 3 1/2 yrs old and are still going potty at night or early morning. They, of course, keep dry during the day and do very well with naptime, but night time is the big one. They wear pull ups at nap & nighttime, since I don't feel like doing laundry in the middle of the night. This may sound horrible, but I've been told to let them sleep in the mess one time and they probably won't wet the bed again. But I just don't have the heart to do that.
I was wondering if she was having other issues, like change in schedule or something like that. Some times that will trigger accidents...espically if she has been great up until they started. Also, I've been told that you need to make sure they go potty before you do...which means waking them up just enough to go potty and then put them back to sleep. I, personally haven't done that yet. My twins are very sound sleepers, so they only wake up in the middle of the night because of a bad dream or they are sick. I've been Blessed that I haven't had any sleep problems, except for the occasional they don't want to rest in the afternoon and are crabby until bedtime. :)
They are still small children, so we need to give them a break when accidents happen. I'm sure everything will be fine. You may want to invest in those mattress protectors that are made of plastic, to help...that way you aren't having to wash everything.
Also, as far as your PCOS is concerned...been thru it and still living proof that you can conceive with it. If you want to talk about it with someone that had gone thru it, just give me a buzz on my private e-mail of ____@____.com and we can talk. After 7 yrs of ttc, we were Blessed with the twins.
Mom to Ashleigh & Austin ~ 3 1/2 yr old