1) She was effectively a glorified PR person (Developer Evangelist) who went on to call people asshats on twitter on some personal crusade, whilst bringing massive negative publicity to the company she is supposed to represent:
"Hey @mundanematt, it's clear from the last 24 hours you're a bully. @SendGrid supports me. Stop trolling."
2) She drags the discussion down to one of racism because someone uses the word lynching in a completely different context.
3) She refuses to express any apology or remorse even after it excalates to the firing of people and a sincere apology from the person involved.
I can't really say I'm shocked the company has let go this person they are paying to bridge a positive relationship with developers.