10 week old grabbing her ear?

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She's been tugging at and holding her left ear a lot, plus sleeping nearly all day and just wanting to cuddle and been extra fussy. She played a tiny bit but then wanted to nap again. She's also been sucking on her fingers but Idk if that has anything to do with it. 
She's eating fine, and her temp was normal. Could she just have discovered her ear and is fascinated with touching it? Or do you think it's hurting? I just thought if it were an infection that she'd have a fever or not be eating.