I would say your safe. As long as she's still going off on her own when you first put her down, hopefully when she gets bored of rolling over she'll go back to sleeping longer. If she's doing over an hour it would seems she's still getting through the first transition on her own, so I wouldn't worry. I understand the APing back to sleep, I often end up resorting to that rather than having to sort out the rest of the day after a short nap.
Oops, there's my LO, be back later.