Have never tried the 783. I have shot 3 factory savage axis without accutrigger. All these had crap triggers but still feed and shoot fine . Around 1 1/2" to 2" with cheap federal ammo. No complaints. I have since worked on my axis trigger. 243 is a great beginner round. Deer and coyote specially. I sort of just experimented with my savage but do suggest buying a used better quality rifle. If elk is in the future consider 6.5x55 in tikka t3 or 270 win with a limbsaver recoil pad.
By all means though take her to a gunshop. I'm sure "Madball" can sit her down and see how the 783 fits her. 243, 270 and even 308. There is a shorter length of pull available in the 783 as well.
I'm just glad to hear someone is getting their lady out and about and she's getting her own rifle.
win win. Good luck