P.N.
The frequent waking could be a growth spurt. Does she go back down after nursing then? I disagree with the person who said an 8 mo old doesn't need to nurse during the night at that age. It is absolutely biologically normal for a baby to nurse round the clock at that age.
Is she upset when you come to bed or refusing to go to bed at 7? She may need to have her bedtime pushed a bit later or her afternoon nap moved a bit earlier. Or she may be overtired at 7 and need to go to bed earlier. Overtired kids also have difficulty falling and staying asleep.
Since it's only been a couple nights, it might not be a new pattern. She may be teething or coming down with something or she might be gearing up for a physical or intellectual growth spurt. I know that my DD adjusted her nursing schedule when she was doing that. Even as late as 19 mos she suddenly switched to a newborn-like nursing schedule but then she started talking and went back to normal nursing and sleeping.