My dd is 21 months. A friend of mine's dd is 17 months, although larger than my child. We have play dates and go to the same activities regularly. This child is a particularly active and forceful child. She has always knocked my dd over and grabbed her because that is just how she plays. My dd doesn't play that way so sometimes it gets a little too rough for her liking. Recently though her dd has started hitting my dd deliberately with her hand and with other objects. My friend is at a loss of how to discipline her and can't come up with something that works. She claims her dd only hits my dd and no other kids. Ive seen her be too rough with other kids but not hit them. I certainly don't want my dd to get hurt but I also hate to lose a friend over what can be typical toddler behavior. Anyone ever dealt with this? Any ideas?