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Your dog is so lucky to have you as her owner. You clearly care about and love her so much. Many people would’ve dropped her at a shelter a long time ago. I’m so terribly sorry you’re in this situation. I know you love her dearly. It’s cliche, but sometimes when you love someone, you have to let them go for the better. Have you seen a behaviorist yet? That may be your last step to try before rehoming. Also, I know you said you went to professional classes where she learned commands. I think she needs more training help than that. Please look up Every Dog Austin and consider private virtual training with them. They have staff that can help address her behavior issues and come up with a plan to better address them. They offer financial assistance, no questions asked. So, you can get 30%+ off by just filling out a form and they automatically email you discount codes. Has she ever played with puzzle toys? This Reddit comment talks in detail about several toys on the market. I’m personally a fan of anything by Nina Ottosson/Outward Hound. You’ll want to start with the higher level/more difficult puzzles like Level 3 and Level 4. Some of them do have removable plastic pieces, so some supervision might be required. Do you ever give her things like Kong’s with frozen peanut butter or frozen lick mats? If not, try getting her a Kong (make sure it’s the black one as that model is for heavy chewers) and a lick mat. Also, you tried snuffle mats? That link is just an example. But, that particular mat even lets you roll it up and tie it so that it’s harder for your dog and therefore more mentally stimulating. You can feed her meals via the snuffle mat instead of in a bowl that way she has to search for her kibble and it keeps her occupied longer. My friend has this bowl that she puts bone broth or plain Greek yogurt in for her dog to lick and it keeps him occupied for quite a while. Easy to refill when they’re done. Lastly, you could try freezing her meals inside of a slow feeder so that it takes longer and is more mentally stimulating for her. Small chance, but if you’re located in Texas (particularly central or the coastal bend), I can help you find a lovely little farm with land and other dogs for her to run free on.