my daughter hasnt been napping (got 1y/o shots on the 6th) she naps once a day now and it takes like…

my daughter hasnt been napping (got 1y/o shots on the 6th) she naps once a day now and it takes like an hour for that to even happen. she clearly is exhausted when we try to get her to nap but she wont relax and just sleep. now she went down at 4pm for a kind of second nap and its 7pm now and she ia still asleep. and im at a point where idk if i should wake her up or let her wake up whenever she decides she's ready. i have this dilemma alot.