On paper, she probably scored very low on the performance metrics they referred to. As she said, she was in a 2-month ramp-up, and had one potential contract and it fell through (through no fault of her own, she says). She was reviewed at the same time as everyone else who had been there for years, and they determined (perhaps with flawed methodology and a bad time for review) that she wasn't going to be a high-performer.
She wasn't surprised that she was called and knew she'd have to be defensive about the situation. You could chalk it up to bad luck, or CloudFlare not wanting to take a chance with her when they were already going through the trouble of getting rid of longer-term low performers.
Also recording it, posting it unredacted, and acting like you've been greatly aggrieved when you've only been there 3 months is idiotic and not good business savvy.
A stronger employee would've said: "I disagree with your assessment and would've hoped that CloudFlare was able to provide clearer communication, and I believe you're in the wrong, but I understand you wish to part ways and I personally wish you the best in your firing meetings."
Frankly she sounds like a pain in the ass and doesn't understand the cold reality of the business-employee relationship.