I'm sure, like everything else, it'll pass eventually. I think when she does it she is just oblivious, and thinking of other things. So I don't think she is being wilfully naughty/ disrespectful - but that is how I take it. Which isn't good.
Sometimes I think I'm a really shit mum. I shout at DD for lots of things that she probably can't help.
I love her so much, and am a very good mum in lots of ways too!