Practice
Placement
Penetration
All outweigh caliber and 'expansion' when speaking of common SD handgun cartridges.
Don't take my word for it, nor that of the ballistic gelatin fanboys.....get out and hunt.
I've taken game since I was still single digit sprout, shotgun, rifle, and pistol. The differences between the common SD calibers are relatively insignificant, the spread between the largest to the smallest is generally less then that of the wounds created by deeper penetration -and- proper placement. I've dropped (instantly) ton+ beef with a single round of 22lr, placement.
People love to geek out over fractions of inches in jello, so called 'wound tracks' and 'trauma', it is largely irrelevant gibberish. But the ammunition manufacturers love it even more because they can sell boutique ammunition in pretty boxes at $2 per cartridge.
I would be more afraid of a 70y/o granny packing a Single-Six that was regularly practiced and confident, then some jello fanboy sporting a mag filled with $20 worth of caliber x/y/x that only went to a range a couple of times a year.
Your daughter being comfortable and confident with whatever she uses is the biggest hurdle, if she's aces on those two aspects she will want to practice and improve her skills which will make
her the weapon,
not what's in her hand.
PS...take note of the part in your post I put in bold