My comment has absolutely nothing to do with her gender.
It's that the grand jury in question wasn't dealing with her case at all. The grand jury was tasked with Julian Assange, who isn't female, but more importantly isn't Chelsea Manning.
In the comment you're referring to, "and declines to point out that her grand jury ended years ago", the "her" was absolutely correct because it was referring to her grand jury, not to the new one for Assange. The whole comment was irrelevant, because it doesn't matter whose grand jury it was that caused her imprisonment, but you're quibbling with the wrong thing and the only outcome of your use of scare quotes is to make it look like you're taking issue with her pronouns.
