Based on some of the limited information available, I think we can speculate a bit about what happened.
She said she's 29 years old and just finished 7 years of grad school. Thus, she must have started grad school at 22, meaning that she likely began straight out of undergrad.
Based on this and her insane level of debt, she must have gone to some unfunded program, probably because she either did not know better, did not pay much mind to costs of attending, or, more likely, was too impatient to get started to spend the time and effort necessary to make her competitive for a funded program.
And who knows, maybe this low paying job with a non-profit may be the best job she can get outside of private practice, possibly because she didn't get an APA-accredited internship. If she did get an APA-accredited internship, she would at least be somewhat qualified to get a VA job, which would pay substantially more than her current job while simultaneously qualifying her for the debt forgiveness program.
Regardless, she is probably also overestimating how much she will be able to earn in private practice, especially if she's just doing therapy and working against all the competition in a big metro area like Boston.