I have modified my slide because there is something in the way these things eject where I could see this situation happening. The problem is on a post in the gunsmithing section, "SR22 mods I did in my garage" I believe is the title. Great post.
If you aren't comfortable gunsmithing though, I recommend plinking out a mag urself, if you feel the casing is coming back at you at all, send this gun in to Ruger asap, as what's going to come next leads to a lot scarier situations lol.
Otherwise work on her form, also, "Talon" makes a very sharp looking and cheap grip mod that enhances your grip dramatically and effects recoil because of it, I believe you can pick one up on eBay for around $13 with free SH