Most likely. Is there a rule that covers outside interference?.......
A ball striking or handled by a ball attendant or umpire is a live ball. I suppose since it “went off” the ball attendant into the stands it’s a ground rule double.
Fenway used to use kids from the high school were Dan Duquette’s son (and my daughter) attended. One kid fielded a ground ball that was ruled fair. The camera caught him sitting there with the most sheepish grin you ever saw. After the end of that half inning, he was relieved and sent home, never to appear on the field again.
Like most teams the Red Sox use female ball attendants these days, and they seem quite capable.
Here’s ya some “outside interference”: