Nap Help Please

I'm a ftm to a beautiful 6mo old baby girl. Well in the last few weeks it's like all she does is crap nap I'm talking 40 maybe 45 min naps. Is this the new normal? And I think it's time to move her from her rock and play to her pack and play for naps because she has started sleeping on her side at night and seems to like that best BUT we co-sleep at night so I can keep her from rolling to her tummy... how do I get her to nap with out rolling to her tummy in the pack & play ? I ask because she can roll back to front but not front to back so she gets on her tummy and gets pissed. Pic because she's so sweet.