V.W.
Growth spurt; and she is learning new skills, so she is waking up and practicing them instead of going back to sleep.
We ALL wake multiple times per night, just not fully. We roll over and go back into full sleep. She is probably having those moments, but waking more fully to practice her sitting up or rolling over or standing skills. :)
I was always told to give them "a few minutes" before going in to them during these times, to see if they will go back down asleep again on their own. Usually they are still sleepy... but we moms jump the gun when we hear them stirring and rush to pick them up.