We stopped using the RnPs at 3 months because they were becoming wiggle worms. As soon as mine were wiggling around in them we transitioned them to the cribs while still swaddling.
Is she buckled in? My daughter slept in the RNP (swaddled) until she was almost 10 months old. She was able to roll/crawl for a while, but since she was buckled she couldn't roll over.
We stopped using the RnPs at 3 months because they were becoming wiggle worms. As soon as mine were wiggling around in them we transitioned them to the cribs while still swaddling.
This was about the time I put my girls into their cribs. I would suggest if you're not ready to move your twins out of your room check out sidecarring a crib. If you have the room it might be a good solution for you.
Re: Rock n play dilemma
Cut the Crap - Weight loss journey of a Few Fat Chicks