Huh, rereading update 9 and Anna's backstory along with the GM entry for type 0 weapons...
Anna sure threw a lot of wrench in that battle.
I'm pretty sure the UN plan at the beginning was something like:
- Use fleet to distract Sekhmet as long as possible
- Valks assault the Breach, especially the AA Antagonist stationed.
- Call the Artillery on the Hive until it's dust.
- Regroup, restock, then assault Sekhmet.
All with the threat that Sekhmet manage to destroy the fleet before they could destroy the Hive, leaving them sandwiched inbetween or they retreat. Add the pressure that Sekhmet then up and disappeared from their sensors.
Of course, the reason then turned to be Anna, the then unknown bogey. Just imagine, there's this heavily damaged and battered frame (who also possibly lost some limbs) coming out of nowhere that then proceeded to mow down the Breach before going after the Hive and blowing it up sky high on her lonesome before buggering off, without a single word. That's how scary she is.
I now get the feeling that her unknown and >30k combat rating was because 30k is the limit of the scale that the UN used to grade the valks. Her combat rating is literally unknown because it broke the scale (and the testing ground when it comes to WFM)