May be they were looking for some relatives evidence who knew about her breast feeding the guy in his childhood
But then they were quick to charge her on the accusation without evidence provided by the accuser but demanding that she provide evidence for her defence.
Slight correction, ‘no marriage age’ allows woman to not cover her face in some fiqh.
No-marriage-age is not a definitive number, I think its defined something along the lines when she is past the age of child-bearing, I think there may be additional requirement(s), but age of 75 definitely would be in that range.