If she's happy to sleep in her swing I say go with it. I have the same problem lately where if I put P down he will wake up. But I have found that if I swaddle him then he will go off to sleep within 5mins and generally has a 2hr+ sleep.
Don't feel like she has to sleep in her cot during the day. I was actually told not to do that as that should be where he associates night time sleeps, so the advice is always different. P usually sleeps on the floor on a rug/blanket and it works for us.