Dogs that have not been properly socialized take time, lots of time and training. I for one would not have her off leash running with my children until she has learned her place in the family. Some in home quite time with the children would help, they can teach her sit, down, shake and treat her. Only teach one thing at a time. Sit to be fed for instance. Have adult present, prepare dogs meal hand it to child, child says sit, /stay..when dog does put down food and release.. Little things like that will help. Some dog training classes for all of you too. 7 and a half month old is a pretty well grown boxer, so she is big and needs to have boundaries. Good luck. I'm sure it will be fine just take time and patience.