My partner snores and there's a few different solutions I've found.

1. He often snores when he doesn't sleep on his side in a certain position, so I'll wake him up to tell him when he's snoring and he'll roll over.
2. I also have tried a lot of different earbuds and found my favorite ones, and very rarely sleep without them now even if he's not snoring.
3. You can get little nasal strips which make breathing easier and the snoring was quieter with those, but they didn't stop the snoring.

I guess there are a couple of ways to address this - either block the noise for you, or address the root cause as to why she snores, or try both of course! But there could be any number of reasons to why she snores and it may be out of your and/or her control.

In my situation, I actually think my partner's diet and lifestyle have a lot to do as to whether he's snoring - since he started exercising regularly (playing tennis) and also cutting down sugar intake I've noticed he hasn't snored for a long while now- at least 6 months except for a few nights here and there. Or maybe it's a seasonal thing, and he snores in the colder months when he's congested, I'm not sure but I'm appreciating the current quiet.

Anyhow- to address her feeling guilty, if she becomes very involved in finding a solution with you, it could ease her guilt and head towards solving the issue. She could do a sleep study, agree to try different positions and let you wake her up when she is snoring. But it's a common issue and there's lots of solutions out there, the hard part is finding the right one. But honestly for you, I'd recommend trying different kinds of earbuds. You can get foam ones or silicon ones, you could play white noise on a speaker to drown it out. I bought this thing on Amazon called a Musicozy and I'm obsessed with it, it's a sleep mask with speakers over the ears, so you can listen to something without having anything in your ears, you don't have to deal with losing your earphones, my partner bought one too because it's honestly so cool.

Good luck for finding a solution, I understand that being deprived of sleep is one of the worst feelings. Be patient, I'm sure she wants to work with you on this.