Hitting 😑

Anyone have the magic fix to help with hitting? Shes started hitting, like really hard, arms all the way up and then slams down, so far we've tried the 'no, that's not nice, we dont hit' ext. Catching her arms mid hit and saying no, ignoring it, reprimanding and putting her down/away. She thinks it's funny, smiles or laughs and tries to hit again. We aren't into spanking..

Getting annoying that she picks up bad habits everytime we go and see other kids 😕