Edit to add, IF she has the magazine in the gun, why is she trying to sling shot the gun? Why not do the simple maneuver that is guaranteed to work and use the slide release? Unless your trying to saddle her with a micro gun that lacks one.
Well, I don't know about this guys wife, but I rarely use the slide release lever. I have small hands and stubby fingers. I simply can't reach the darn things on most semi auto's.
Secondly, there are some SD schools that advocate releasing the slide manually over using the lever, for a few reasons.
Too be honest, I'm still having trouble with the concept that this is something that could be an issue. I can understand having trouble racking a slide completly (I've run into a few heavy springs that gave me a work out) but from a locked back position? That's always been the easy one.