It doesn't matter how old you are or how much you can offer a school or you actually care more about the kids than saving face. If you somehow piss off an administrator, that person will move heaven and earth to destroy your career and your life. This one resigned before the principal could "dismiss" her or "non-renew" her or whatever fancy term a school district uses to dump a teacher.
At least this person has a spouse presumably working. There are those of us in this world who don't even have that and are struggling like hell.
Six years and counting for me. I am getting closer and closer to qualifying for early Social Security, if I live that long, which of course will be reduced further because of the bullshit WEP. I'll be lucky if I get 1k a month total between Nevada PERS and Social Security. Right now it's still nickel-and-diming everything, working part-time, minimum wage, no benefits, in a "training" program that is most likely an exercise in futility.
A teacher "shortage"? Not in this part of the country and I doubt anywhere else despite some claims of massive walkouts by teachers quitting or retiring.
My grandnephew's wife is in college right now, along with him. She was going to go into pediatric nursing, but now she thinks she may opt for teaching. I warned her against it although if she wants to work in pre-school, that is a completely different ballgame.
There is no point wasting thousands of dollars going into debt in a field where at least in this state, there are few or no jobs to be had of any kind in the field without subbing for years and years. Then IF you manage to get a job, you are totally at the mercy of some administrator. If that administrator is good, well, God bless you, but those are few and far between.
If you don't, you will wind up like the teacher in the linked post who decided to call it a day after HER FIRST YEAR.