3mo old pulling hair?

Mo

My 3month old daughter pulls her hair, scratches her head, or pulls her ears but ONLY when she is crying for something(is hungry or being put in Her car seat etc). She doesn’t seem to do it randomly or seem extra fussy. She just does it when she wants/needs something. She has a twin brother so some times she has to cry while I tend to him. Idk what’s going on with her and feel bad she is digging into her head.