Wrong. There are strollers that are small. They are made specifically to be stowed in the overhead bin. She was told it could be brought aboard.
Even if you were correct - which you are not - do you think it was appropriate for the FA to hit her in the head while she was holding her twins?
American is supporting the woman and is flying her first class.
She was given permission to look for storage for it, which she did not find. When she was crying, she was asking for her stroller back which, from the comments made by the FA and the other passenger, was after she could not find storage for it. So where did she think it was going to be stored? Why is she asking for it when she already knew she couldn’t find storage for it?
Of course I don’t think it was correct for the FA to hit her, but I didn’t see that on the video. The male passenger says the FA “almost” hit her in the head, so I don’t know if she did or not.