380 auto and 380 acp same thing.
If it is not to long for the magazine it should fit.
Did she get slide racked back far enough for it to cycle properly.
Did she ride the slide forward doesn't take much to slow the slide down.
The one I shot worked well don't remember what ammo was used.
But the lady that owned it had a hard time operating the slide.
Those very small guns are nice to carry but can be hard to operate.
Take a dial calibers and measure the length if it is in specs I would say it could very well be operator error.
But some pistols well not function with all ammo.