I agree with this. My roommate has changed jobs 1 month after joining. Granted he could afford it given 3-4 years of experience he had at the time.
The reason was also toxic environment.
His immediate next job is the same he has had for a few years now. Swears by it and would never leave. He did cycle through 4-5 workplaces to get there though.
Well worth I think.

How did I accept it two months ago? Its not like I knew how the situation would evolve and signed a deal anyway. It started off as normal conversation.
Youre right.
Entire building is on one accord. They seem to be losing a lot of employees due to that guy.

OP are you looking for a way to get her complaining off your back, or are you looking for a way to guide her through a shitty time?

If it's the first, take into account what Eddie said.

If it's the second, your best bet is to put things into perspective for her. Suck it up for a few month, and get a shot at a promising career for years ahead? It's not a bad trade in my opinion. But like DJ said, experiencing that toxic environment - first hand - on a daily basis can easily get you to lose focus of that. So just make sure to remind her of it from time to time.

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See, this is unrealistic. A guy with a few years experience leaving a job early, ok, he can do that. A chick out of college leaving a job 2 months in? Thats a tough position for further interviews. Its not like a hiring manager or recruiter is going to hear a college grad say "it wasn't a good fit" and just accept that. They're going to follow up with why wasnt it a good fit, because they dont want you to come work there and leave soon as well. You say a "good employee" has power..yeah.... but the chick is out of college. Her resume is going to say she graduated, work ed one place for a while, then couldnt handle the next real job. Maybe she can explain that her work environment is toxic, but to a recruiter or hiring manager, they cant just assume it was too difficult to stay. Its fucked up, but thats how hiring works. She's a college grad at the end of the year looking for a job. Tough time to go looking, and more tough when you leave 2 months in.

Now, its a tough position, not impossible. What I'm saying is "leaving" isnt as simple as that, and tbh OP's chick prob cant handle that. Sure, she can leave, which is the best for her emotional well being, but, get ready to hear her vent on the difficulty of finding a new job AND working the old one. Regardless of what she does, either stay at the current job or walk out tomorrow, she is gonna be venting. Thats why I say it sounds like she needs to learn to be happy despite bs at work. She was venting when she was in college. Its the same issue that OP wrote months ago. She doesnt have a fulfilling life so stress takes a bigger toll on her.
Where is she going to run to when there's a shitty situation in her life?