J.B.
It sounds to me like she's working on a developmental milestone. My child is normally a very good sleeper but whenever she's trying to sit up or crawl (she did it A LOT when she was learning to roll) her sleep is kind of poopy. What I do is just leave her be if I hear her wake up and I know she doesn't need to eat. Once she gets tired the majority of the time she'll fall back asleep. Sometimes she'll start to cry instead and then I'll go in and rock her a minute or two and she'll go back to sleep. Once the milestone is reached she goes back to sleeping normally.