Femal lab mix 1 year old

We have a female lab mix.
She's medium size so far so not sure what else she's mixed with.
She's a good dog however she likes to play rough when going outside and she's scaring our kids.
She's knocked the.
Down barked at them.
She does have a little limp after playing outside with the other dog yesterday.
I think she was running to much.
I don't want her going to a pound.
All I'm asking is a 75 rehoming fee because she will need next round of shots.
She is spayed.
i will only send pics to people who are serious.