Earlier quoted context omitted.
Erm, isn't 10 hours a day approximately one full-time job? If she's, say, taken a six-month sabbatical to learn to make websites, this seems eminently reasonable and doable without speculation about mental illness.
Also doing it out of a paid-for shared workspace. I mean, I love the stuff she's doing, it makes sense that she'd be able to do it working full time, but she must be independently wealthy to be able to afford it.
Use of shared desks costs like $200 a month at places like Citizen Space, so it's not like that's a bank breaker.
If she had a family it would make less sense. If she were living a 'baller' lifestyle, drinking and partying every weekend, it would make less sense. But if she's an unattached workaholic, her life probably costs very little and no independent wealth is required.