Unless she is crying/upset, I'd just be there in the room, just ignore her, if she is calm try to leave, but go back if she is upset.
If she isn't upset, don't do pd, just be there if she needs you there to relax... the idea of independant sleep is to help them relax enough to go to sleep, it isn't to get them lying down, or stop playing, if she needs to roll around get up & down to relax, so be it... she will tire of it in a while & you will also be able to leave the room when she is ready.
I'm also thinking that if she is taking 1/2hour plus to fall asleep & is 14mo, she is ready to move to 1 nap... I'd cut the am back to 20-30mins max & move the pm to 1pm & see if that helps things