I think it is a GREAT idea. But I already had a .357/.38 in 3" and I have no problem with the recoil.
There is also the question of whether the ammo will expand, and if it doesn't, then bigger is better.
Now, you have me thinking about it again. For my wife. But if you're honest, it does have that magnum blast, right? She'd probably rather just have a good old fashioned .38.