BBM. This is what bothers me about TH. In teaching, you have to take what you can get. You're not going to get the exact teaching job you want right after that degree is placed in your hand or you get your certification. When I was applying for teaching jobs after getting my degree, I applied for whatever I seemed qualified for, even tutoring and grade school (I never wanted to teach in grade school). The point is, you have to start from the ground up in jobs like teaching. Sounds to me like she was being picky about what teaching job she wanted, and when she didn't get it quickly, she gave up and did substituting, and then quit doing that too.
She strikes me as someone that if she can't get what she wants in short of amount of time, then she gets bored or angry and decides to move on to something else. Getting a good teaching job takes a lot of time and a lot of luck. I've been teaching since 2004, and I am still at the adjunct stage, albeit at a community college that I love. And it took a hurricane and moving to a whole other state to find this college too. I may never get a fulltime job and I accept that. But I'm not going to give up doing what I love either because I haven't been able to get the teaching job I really want as of yet.
If she really loved teaching, she'd stick it with it no matter what kind of teaching job she could get and no matter how long it took to build a teaching career and get the teaching job she at one time yearned for. Instead, she quit looking, got a minimal teaching job through subsituting, and then quit doing that. Sounds like she wasn't as dedicated to teaching as she'd like people to believe she was. And what a waste of a Master's degree. I worked damned hard for mine, and I am going to continue to use it as much as I can. I'm wondering if her degree was more towards making her look better reputation wise than her actually using it to get a good job.
Now the DUI could make it hard to get a job, and that's an element I never had to deal with. But if it were me, I'd grovel, beg, and do whatever I needed to do so I could do what I love, which is teaching.