The tail and ears are fine, but why a cat paw???

Emphasis on the fact that someone's putting her up to dressing up like this. And God Bless them.

Some one is putting cat part on her body or she is tranforming into on alittle. :)

When Aegis overheats she turns in to a cat?

I'd wager she overheats when embarrassed. Like when someone puts her in cat props.