They bought out her contract because she didn't do anything they could fire her for.

The speech that made her radioactive was a speech they signed off on, endorsed, and probably helped write.

Honestly, I was surprised she didn't quit after they publicly humiliated her by having Amouranth rolling around a ball pit in a hot pink bikini just two months later, but I guess forcing her employer to buy out her contract was indeed the smarter option.