OP,
I do think you have been given a tough time and I think unlike a crush on another man that could potentially be normalized and brushed off slightly more easily, a crush on the same-sex when you have never ever showed interest in a woman before can definitely be unsettling and quite intense (I find relationship between women more intense anyway).
I have had this happen to me, though unlike you, I guess I had had pointers that I may have not been straight throughout my childhood/teen years but I was oblivious to them (or purposefully trying to ignore them) so the first time I really developped a crush on another woman I was consummed by it and it really made me reconsider everything I had known about myself and had felt in the past. In my case, I later found out that I really am just gay (or bi with a strong preference with women) BUT that being said I also know plenty of women who have had this just "once in a lifetime" crush on a person on the same-sex and never felt like that before or since that one person, so it might not mean anything.
I have had it happen to me in reverse a few times now in the last few years where I am the queer person and end up meeting a straight (identifying) woman and for some strange reasons, attraction is there and it's always so so intense, way more intense than with a fellow bisexual/gay women, it's kind of inexplicable because the same way I know it's a bad idea a part of me also hope they are actually bi and in the process of figuring it out and while for some it might be the case, for some of them, it really is just a "once for no reason" thing where we don't know why it's happening and they know the second it stops they will go back to man and never think of a woman again but they just cannot explain why they suddenly crave this one woman (in this case me).
I wonder if they just pick up and the queer vibe and I pick up on theirs and that's what happens. I used to find it tempting, OP, and if your DD's teacher is like me she might very well feel it too BUT with years, I have learned to try and avoid getting in this type of situations, most women are not ready to be in a relationship with another woman when they've lived a straight life their entire life and while they are keen to fall into the spell of lust it does hurt when you are gay to have a woman get close to you before freaking out and going back to her "heterosexual life", if she's been there before she probably won't want to get there again. And while it's important you try and figure things out, I do think you need to keep in mind that you do know very little about this woman and that uprooting your life for her (specifically) would be a mistake.
I suggest therapy too, not because you are unhinge or something like that but because you need to be able to talk about your feelings and work through them to try and understand where those feelings are coming from and if whether or not they are defining your sexuality in anyway. A therapist that have experience with LGBTQ+ issues would be great. Reach out to forum about people who are questioning or thinking they might be gay, and see if your story resonate with others and how life turned out for them.
You may also want to talk to her about it, it might be weird (if she doesn't feel) it and potentially dangerous (if she does feel it) but getting to know her for her, might just kill the vibe and attraction you have if you realize she isn't all that you imagined/pictured in your head.
I used to teach, and while I have never developped a crush on my students' parents, I definitely wouldn't have shamed a mom for developping a crush on me and telling me about it. I probably would have been flattered and delt with it appropriately without it impacting the kid or the relationship with the mum.
I think how you should deal with it highly depends on what your ideal ending is. If you want to keep your mariage intact then working on overcoming your crush and regaining confidence in your sexual orientation is paramount, if you want to end up with her, then figuring out how you want to go about it all while causing the least damage possible is necessary and if you don't want her but don't want your husband either, figuring out what would make you happy is important.
I do think therapy would cover a lot of that though and be quite helpful.
Feel free to PM me though, if you feel that might help!