Baby sleeping should I be worried

#B

Hello my baby is 3 months old and today she took a few short naps but then took almost a 3 hour nap later this evening. I woke her up to feed and change her and she was so hard to wake. When I changed her diaper she fell asleep during me changing her. Is this something to be worried about? She did eat just fine once she was up but just seems super sleepy still and is back sleeping again after only being awake for an hour