Thanks for the comments, everyone.
When they first played we were all on the couch so I could see what she was doing. Any time he touched her or her him I praised her to let her know it was good. That was the first time she had him laugh like that.
I just think it's funny that since he's been 2-3 months old she will bring a ball & drop it right on him. Luckily they're small. She's not going to waste any time.
