Is there a 16 month sleep regression or anything that would affect sleep?

For the past few weeks to a month my 16 mo has been awful to put to bed. She takes great naps, her naps are between 12:30-3. We put her to bed at 7, but she usually won’t even fall asleep till around 9!! Of course I go in to comfort her if she’s really crying, and then when I leave she cries lol.

Tonight was the worst of all nights! I got her ready for bed at 7, gave her some Motrin because I know she’s teething(or at least I think so, she’s drooly), gave her a bottle and laid her down like I always do. I went in there three times. The first time I gave her another bottle that she drank half of, the second time I just went to comfort her and she was twiddling and such, the third I went in and gave her the rest of her bottle and left. She just fell asleep at 10:45. But she was fighting it, tossing and turning lol has anyone else experienced this with their 16 month old?