I would put her in her own room, your movement/breathing could disrupt her sleep at this age. As well, I suspect teething too.
The reason that she only wakes for the second half of the night is biological in nature. Lots of sleep hormone until midnight, then it tapers and drops dramatically around 4am.
You need to eliminate the CN, she is getting too much day sleep - I think she is likely UT at BT. I would push her A times over the next week to get her to the 3 hr time.