My Little Girl Cat Likes To Play Rough

I have a six year old cat. She's really a sweet shy girl but she likes to play rough. She's a smaller cat about 3/4 size than normal and the boy cat next door, who is a bigger cat, allows her to run and jump on him and rough house. He smacks her around which she takes in stride. I let her play rough with me, my right arm is pretty scratched up. Question is will she grow out of this? Should I stop playing rough with her and if I do will that help her move out of that or will it just frustrate her?

I am not a cat person, she is the first kitten I've ever raised so I'm not familiar with what is normal cat behavior. Appreciate any insights.