I have 11.5mth old, just went thru exactly the same thing... He has always been a horrid sleeper but just STTN twice recently, but apart from that he still wakes at least once or twice a night.. But in last few weeks it was multiple wakings sometimes 4times, yes it does our heads in too...
All u can do is rule out medical probs, (ear infection, sleep apnoea) tag team the night wakings with ur partner, try night weaning? If she is really hungry maybe a growth spurt.
Our DS was teething, going thru walking milestone and havign night terrors, fighting day sleeps re transitioning to one nap all at same time.
The only reason I am typing coherently is because I have had 2good sleeps in a row, becos my partner has been doing most of the night wakings. After a year of major sleep deprivation I was at end of my tether.
I always put DS to bed earlier than usual if he has missed nap or had short nap thru day... Otherwise he gets so fatigued easily then it's so hard to get him to sleep during the day which then compounds the night wakings cos then when he wakes he can't go back to sleep cos OT.
Is she walking or standing up yet? Do u know if it's a wonder week?
U have my sympathy, I have felt like it was possible to die from sleep deprivation sometimes! The exhaustion is unbelievable. Good luck hope u ride it out..I just keep thinking, every month sleep is getting better...lol