Maybe...she is human on the inside and just can't make it to the toilet in time
FGS
Take her OUT for a WALK before you go to bed, not just chucked outside for a wee on her own..
Bitches do tend to be clean so i don't know why she lies in it.. but still.. make sure she has a constant supply of water as well because if she hasn't and she binge drinks its far more likely she will wee in the night.. 'tis a long time to go, overnight, and she may have a weak bladder..how old is she?
She is NOT doing it to piss you off, although i can understand you being, dog wee doesn't smell very nice and nowt worse than only noticing it after you have waded through it in your bedsocks
Do you have a new baby/have arguments with a partner? I ask this because my own dog is sensitive to such things and wet for england when my ex lived here.
Please don't give her away if this is the only problem you are having, however if you resent her the 'dog is for life thing' goes out of the window because frankly...she deserves better and someone who is more understanding.
This is why dog owners should be vetted and licenced IMO