I am not a football player, but is that not called a split end in ancient football jargon?
“split end” would be an insult to split ends everywhere. It would also insult wide receivers, tight ends,punt receivers, or any job requiring catching a ball. In a pinch she might get to be a designated punter since she/he/it is good at that. But if you made me put her in a game it would have to be “ball holder.”