Not much, she just claimed that Sega were "shady", and that she tried to contact them for 3 years but they never answered. Nothing specific.
Despite those actions, SEGA could at least have some clarity about what's going on instead of leaving her in the dark.
She was a freelance contractor for Archie. Chances are good Sega in general don't know who she is. I'd say she'd best send her inquiries to IDW instead of bugging Sega.
Twitter doesn't delete replies if the parent post is deleted. You can backtrace a lot of commentary here.
Bloody hell, there's a Tweet there from January of IDW reaching out to her. https://twitter.com/IDWPublishing/status/1088547346877534208 I don't think this was Sega's fault....Aaaand she says it is solved now....Okay whatever.
Ian Flynn tells the tale of a dodged bullet: https://twitter.com/IanFlynnBKC/status/1243650393265131521
Hm, a piece of Chaos attaining it's own consciousness might have been an interesting idea. I could see a Venom-like relationship for it and Sonic, if push came to shove.
Wow sounds like the kinda shitty fan character I'd of come up with during that time. I bet he could have done something with it, but fuck what a stupid idea.