My mom’s smashed knuckle and learning acoustic guitar

My 61 year old mom the other day suddenly asked me to teach her acoustic guitar. I’m the only traditionally musical person in my family so naturally I was very excited to share my knowledge from 10 years of playing with her. And she’s really a super fast learner in 45 minutes she can play Emaj and Emin perfectly and transistion between them at speed. However we ran into a big problem. Maybe a decade ago a blade came into her finger and crushed her top knuckle on her fretting hand forefinger. She almost lost her finger if not for her wedding ring. Thus she cannot bend her third finger unless she puts it down first and even then she has to invert or partially invert her wrist. She never got proper guitar focused physical therapy because at that point she never played an instrument. Thus I tried to teach her a basic two finger power chord shape and the open Fmaj7 chord. Neither is possible for her really even though she has great form. I know about Django Reinhardt, Dave Mustaine, Tony Iomoni, Jerry Garcia, Joni Mitchell etc. but this is about my mom. What is the best solution for her? Drop D so only one finger for power chords? Training the pinky to replace the role of the third finger? Use simplified chords, shell voicings and double stops in an attempt to liberate the other fingers that aren’t broken? Should she just learn slide? Play lefty? Bend the third finger till it can be a normal finger? Has anyone gone through this and do you have any advice? She just wants to play… she’s an incredible singer with a 3 octave range but really wants to either play piano or acoustic guitar which sadly both require a highly functional third finger in most cases. Any tips… what can I teach her about what Joni and Tony and Django and Jerry did that won’t further hurt her and is adaptive and ergonomic?

-Juniper

That was 100 percent my thought as well. Also have been spending a bunch of time finding alternate shapes for everything where I can find inversions with only two fingers and then as many damn open strings as possible. thanks for your time.