Half the time it's not necessarily aimed at anyone, if I tell her off. She'll go into the other room and just slightly nudge her baby sister. Not hit as such. Then I correct her then she'll go up to the wall and say "no you naughty".
She doesn't do it much but just recently it's been more frequent. Obviously toddlers experiment and test boundaries. I think she's picking up a bit from playgroups too where personalities are evolving and clashing.
What do you do when you are trying to tell them off and try hit you?