the part of getting positive performance feedback from her managers you decided to omit from your take?
BUT, having worked in tech for well over a decade now, you should absolutely 100% not believe any feedback that's given to you. She's in sales. She should understand that there's exactly 1 metric that matters, closing deals. I'm not saying it's her fault she got fired, but this should really be a lesson for everyone watching this video. Do not believe what they tell you.
So let's say a manager tells their sales rep to focus on understanding well what the customer needs, before closing the deal. Sales rep doesn't give credit to the manager and rushes for a close. Customer turns out to be a bad fit for company's products and services. Now, the company has a liability.
Management exists for a reason. There cannot be “exactly 1 metric” in any job, unless it's paper clip maximization.