Why is she mentally ill, now? Clinton says her program displayed eldritch runes, then prompted government agents to show up and EMP it. She says the program made satellites be friends and that the government threatened her family if she revealed its secrets. Outlandish though it may sound, her story checks out. I mean, this is also the comic where a perverted robot got access to a military laser chest cannon because a sentient truck was having sex with another truck. I could buy "The satellites' view from the stars gives them insight into the dark horrors of space undreamt-of by man" about as readily as "an A.I. achieved apotheosis and magically put a farewell message on all computers, even those not connected to the internet, as it ascended to a higher plane of existence," which is also another thing which has been established as part of the history of this comic universe.
Her "Clinnnn-tonnn" thing is weird, yeah. I knew people in high school who behaved similarly. Most of them disappeared by college, but I suppose I could see some having kept the "quirkiness" that long. Especially if she's playing the "so smart she's dumb" archetype, which she might be given her apparent skill at...artificial orbital intelligence psychology? Let's just say "programming".
I dunno. I don't exactly like her character, but I don't think she needs some kind of clinical diagnosis to belong in the world the comic takes place in.