If she’s totally new to shooting, I’d suggest a .22 to start with - ammo is dirt cheap so it’ll allow her to get comfortable through practice. Plus, there’s virtually no recoil. Then she move up in caliber from there, as she becomes more accustomed to shooting.
That’s the way I did it. I’m a petite female & had no shooting experience whatsoever 2 years ago. A friend took me to the range & I tried out a couple of his 9mm pistols - their kick was more than I was ready for at that time. Bought myself a .22 to start with (Ruger Mark III - major PITA to reassemble but a good learning experience). Then switched to a revolver (Smith & Wesson Model 15). Next one was a S&W M&P 9mm - doesn’t seem to have much kick at all, but then again, I’ve gotten much more comfortable with shooting. I expect it would’ve been too much for me when I first started out.
I’m happy with all 3 of my choices, but the 9mm is now my favorite - it’s dead accurate & 9mm ammo is still relatively inexpensive.
Great to hear from a female.