Tell Mare she has an ego, and she will deny this.
When the last mod upgrades came, Mare was certain she deserved Media Powers. She didn't. But it didn't stop there. Despite being literally the only person who truly believed Mare needed Media powers, she wouldn't let the topic rest; going as far as creating a seperate discussion about the requirements for mod upgrades. All because she didn't get what literally only she believed she needed. This wasn't even the first time mod discussions were Mare vs. the rest.
She will still deny her ego.
Her behavior and ego once took its toll, but on a person she considered her best friend and admitted she would be sad about should he quit the site. When said person quit the site and broke off all forms of communication with mare because of mare and making clear that it was because of her, she did the opposite of her own claims. She felt no remorse. Absolutely nothing. The prize of her ego had to be paid with the loss of her best friend, and she felt absolutely no remorse or reason to; instead sticking to the idea that she was completely in the right because that was the only thing that mattered to her there. She didn't even apologise at any point, sticking to her own egoistic values.
She will still deny her ego.
One of her arguments for not having an ego is because "others" told her so. Said others are people who will do absolutely anything to suck her dick, and an absolute suckup who has admitted to appreciating and promoting the blatant dicksuck a reputation brings. That's like Stalin telling Poll Pot (pun intended) that what they're doing isn't evil. Even with those people included, a majority will tell her she has an ego.
She will still deny her ego.
Such obliviousness to an ego is a sign of having an ego by itself.