Sometimes older folks get a little confused or careless about taking meds - I mean no offense, I've gone through this within my own family, but please have somebody be with her and keep her on the dosage regimen exactly as prescribed until it is all gone. That is very important.
FWIW, I'm 76 and have taken cipro many times with no ill effects, the most commonly feared one of which is weakened tendons. At age 87, and as sick as she is, I doubt she'll be doing anything strenuous..
That said, I've prayed for her doctors' wisdom and compassion, and her full recovery. I wish you both all the best.