Hey there, is prob think you may need to just shorten the nap a little, maybe just try putting her down 15 mins later but get her up at the same time. There is a big development leap in language at this age so it could just be that.
If she's not upset I'd leave her be but keep in mind that if she doesn't nap or takes ages to go to sleep at night her BT might need to be brought a little earlier.
We had nap refusal at this age and I used to make sofa comfy and have cuddles then he slept or go fur a walk drive to shops if he totally resisted.x