I can’t say (he said, she said scenario) if she did or didn’t threaten him with worse.
I will say that the charges in the original attack should have been filed to get them on record.
I know women who’ve been harassed by men (not even always anyone they dated) and such charges help in getting a restraining order should they become even more violent in action and threats.
The sex of the attacker and victim are not the point.
And yes, false reports carry a charge as well.
They will have gone into a police report, so there is still a record of them.