If she doesn't have arthritis or carpal tunnel or any other physical impediment, just get her the .357's and let her have fun. What's the problem?
Mind you, +P's are a tad much for me anymore out of my snubbie, but my rheumatoid arthritis is slowly winning the battle for my hand joints. But only a couple of years ago I was gleefully shooting full house .44mags (out of a long barrelled SRH, true, but still....) and having a blast (literally!) doing it.
Give her what she asked for and just double up on your ears. Not for the .357's. For the "YEEHAW"s to follow
Jan