If you take the attitude that she won't train with it, then the semi-auto shotgun is the poor choice between semi and pump. This isn't because of how well it shoots, but because of the possibility of needing to clear malfunctions. If something goes wrong with a pump, an untrained person will try to pump it which can free some malfunctions. If it goes wrong with a semi-auto, they tend try just pulling the trigger again and looking at it...which does no good.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011