I disagree. 7.62x25 isn't forceful but snappy, maybe a little more than a steel framed pistol shooting 9mm. I have a polymer compact SD9 that seems to have a ton of snap. 45acp, although a slower recoil impulse, is more forceful than both, in my opinion.
Felt recoil is different for everyone. Not many pistols to choose from to shoot 7.62x25 other than the Tok - and it's a very crude pistol with awful sights and trigger. Tons of options in 9mm. I think these are options that may not work for her if she has an injury.
I'd say that a full sized revolver in 38 special or the 380acp 85% sized 1911 coming out by Browning would be the best bets for the recoil sensitive. That little 1911 might be the perfect size and the right low-velocity centerfire caliber for her. Wanstall's has some on preorder if you want to contact them. 380 is more expensive than 9mm though, so is 38special.