Saying “I’m tired” a lot….

My two year old says she’s tired a lot. Like multiple times a day. She has adequate sleep trust me! Like 2-3 hour naps every day. While she has been fighting something I notice it randomly when we are around other people. Could she be shy? Maybe feeling something else but can’t communicate it? Should I be concerned like it’s something health related vs. emotional? Just curious if anyone else has a LO saying this too.