Idk what's happening, just turned 16 months

Jasmine

The last week has been rough, not sleeping all night (which she's only been doing that for about 3 weeks now). She will scream for hours (of course I give up after 1) if I try to get her to go back to sleep in the crib. Today is the first day she would not take a nap, I tried for an hour and a half. Is this 16 month sleep regression or something I'm missing. No fevers or anything. Not fussy. She just won't sleep. HELP!