Any sign of teething?
Often LOs seem fine in the day but the nights are awful, it seems much harder to get through a night in pain than a day when there are many distractions around (including a lot more attention from parents etc, more touch etc in the day).
Maybe try some pain meds before night sleep?
If she's having a decent amount of milk in the day she really shouldn't need to be fed every 1.5-2hrs at night so those NWs are unlikely to be hunger. More likely teething pain or habitual.
Remind me, did she used to sleep through the night (with 1 or 2 feeds)?
If it is routine related then all I can suggest is getting her to her full A time so that naps are decent and help to fix the night.