2 yo nap trouble

Calips

My daughter just turned 2 this month.  She has always been a good nappers and sleeps 2-3 hours.  Often she talks and chats in her brib for 30 min to an hour before falling asleep.  The last few weeks a few times (maybe 4 total) she has never stopped talking and it escalated to screaming for Mam or "Michele!" (love that kid) after about an hour. 

I have gotten her out of her crib because it seems clear the nap is not happening.

This has been sporadic but I am starting to worry about its impact on her consistent napping.  She never seems that tired at naptime but she usually sleeps 2-3 hrs so it is clear she needs one.

 Any advice to keep the nap intact?  thx