She's still young, what time does she go to bed? I can't remember how old is OK for CIO, but you may want to try it... I know it can be tough, but when DS went through a sleep regression around 9/10 months, it only took maybe 2 nights before he was back to STTN.
DS goes down around 8/8:30p and sleeps until 8am. I mean, some kids just dont need as much sleep but the later you put them to bed the later they'll sleep, at least thats my experience and it makes sense. Good luck!