Gaprindashvili's GM title was a gift from FIDE, because she had not played enough games at the norm, to qualify under the rules of the time.
The reason that FIDE made an exception for her was that at that time the only tournaments strong enough that a participant could make a GM norm were invitation only. Gaprindashvili easily qualified by results and rating, but was invited to qualified tournaments that totaled only 23 games rather than the required 24. She could have gone 1-9 in any other tournament that barely qualified for GM norms and still made GM. FIDE didn't want to look like they were deliberately discriminating against women. Besides, no male GM she played ever claimed she didn't deserve the title.
Wasn't one of her norms from Lone Pine, a Swiss open to anyone above a certain rating?
My understanding is that she was far from the only one to get a title despite not having quite enough games in her norm tournaments by the standards of the time. I believe the rating requirement was 2450 at the time, not 2500; by the current standards, she wouldn't have earned the title (other than by being women's world champion) since she never reached 2500.
Gaprindashvili's GM title was a gift from FIDE, because she had not played enough games at the norm, to qualify under the rules of the time.
The reason that FIDE made an exception for her was that at that time the only tournaments strong enough that a participant could make a GM norm were invitation only. Gaprindashvili easily qualified by results and rating, but was invited to qualified tournaments that totaled only 23 games rather than the required 24. She could have gone 1-9 in any other tournament that barely qualified for GM norms and still made GM. FIDE didn't want to look like they were deliberately discriminating against women. Besides, no male GM she played ever claimed she didn't deserve the title.