my baby's only slept 1.5 hours total today

She refuses to nap.... she's only taken two naps one that was 35 mins and another that was roughly an hour. It's now 5pm and she gets a bath and goes to bed at 7/7:30. She will not nap!! I've tried everything! I know she needs more sleep but she just won't sleep! Should I be worried? Or just let her stay awake till bed and hope she sleeps longer