...if a state or local elected official qualifies for a federal election and fails to turn in a letter at qualifying, the official is automatically forced to resign.
Resign from office? She did. Resign from the election? Why? Their whole point of contention is that she would potentially use her office to aid her campaign.
If it was not a mistake, that's great. If she is still qualified, that's great. If she disqualified herself, then she's an idiot and should have the book thrown at her.