We've had over 6 months of looking like we're losing the nap and then back it comes. We've even had periods where he's slept more than he ever has! So, yes. This is likely to be a temporary thing. You may find she wants to keep some no nap days, or you may find you need to cap the nap on certain days. It all depends on how she copes with it, and whether her nights begin to get affected by how she's napping.