She fought extremely hard over a long period to make herself fit within the industry, and found that had a profoundly detrimental effect on her health. That, not inclusiveness and diversity, is the status quo.
I doubt this will be a popular take on it, but she seems to have let coworkers she didn't particularly care for become her whole social life. Of course that would make someone quite unhappy. I was like that perhaps 10 years ago and I had to become much better at creating boundaries between work and the rest of my life; this made me much happier.
If she wanted a suggestion, I'd tell her to look for companies with older people in them. They often have kids, and treat a job as a job -- you come, work, and leave -- rather than the entirety of their existence. I don't have kids, but I find myself much happier when the median coworker does.
