She could possibly be a bit UT if she gets a 12 hr night and a 2.5hr nap? I'm sure some LOs can do that and do need that amount, just thinking mine lengthened his night sleep up to 12 or even 13hrs when he moved to one nap but after about a month his shortened his night back to his more regular 10.5 to 11hr. If she is UT for her night sleep it could cause long NWs.
There is a section in one of the BW books (I forget which, sorry) where Tracy says that it is totally normal for LOs to wake for long stretches in the night, even hours, and you should leave them to it. Obviously we always look for a reason that LO might be waking at night, heat/cold, routine etc but if you feel relatively confident that the bigger picture has been looked at and everything looks okay then that's when it comes down to what Tracy said, that they do just do this, leave them they will go back to sleep and learn to sleep all night.
Clearly if she calls for you or cries she needs a response but if she is just awake and quiet or making noises which are not "I need you" noises then Tracy's guidance is to leave her to it.
It sounds like she starts out by calling/crying out for you because she doesn't know what else to do, you respond (as of course you should) and then you get stuck in the room. I would suggest a plan of sleep training for the NWs either GW or WIWO, verbal reassurance from outside the room, whatever method suits you and you believe you can be consistent with...it might be a combo which is just right for you and DD, yk?
Mine also had long stretches awake and I did a bit of a combo, if he called (not crying) I called back "it's night time, go to sleep", and I might not answer every single call, certainly the first one or two but then possibly not every one but perhaps every other one, enough so he knew I was right there and he was not in any danger and had not been abandoned but also this is not a two way conversation to go on all night either (hope that makes sense). If he make upset or very insistent I would go into his room and put a hand on him and tell him "it is night time, go to sleep" and depending how he was I might stay a few minutes or longer or I might leave right away. The process being just like initial sleep training where by you give as much as is needed to reassure but you don't get 'trapped'.
Although your DD is totally independent going to sleep at BT she just hasn't learned that in the middle of the night she is still safe enough to go back to sleep alone so she needs your company to do so.
I suggest either try a shorter night and see if the NWs stop or sleep train for night sleep so that if she wakes she can lay there alone but not upset and eventually go back to sleep, at least then you get a better night.
