Mother in Law out of control a year post stroke. How do I back away?

My Mother in Law suffered a stroke during our engagement. We re-organized our wedding dinner reception to take place in the facility where she lived so that she could participate and we have been trying to accommodate her every wish since. She has been in and out of Assisted Living because she hates it and is non-compliant. Recently moved back to an independent living apartment with her 82 year old husband against our wishes. She is in a wheelchair and shows no interest in getting stronger (has fired 3 PT companies because they tell her things she doesn't want to hear) but wants to control everything. She calls and cancels doctors appointments, calls her insurance company multiple times a day, refuses to get on the facilities wheel chair van for doctors appointments, etc. My FIL suffered an injury recently and is now in rehab (we hope temporarily) so we've had to secure 24/7 care for MIL during his absence. She hates the caregivers so we've had to spend more time caring for her while he has been in the hospital than we've been able to spend with him. She is so disruptive and demanding and nothing we do is good enough or the right thing. She is often times combative when not getting her way (cursing and kicking, screaming, shaking her fists) and will call our cell phones over and over and over again if we are not with her. Often times her calls will be for things such as, my blanket is not covering my feet and I need someone to come help me know it's an emergency. My husband and I are the only two family members in the State. We are exhausted as we cannot do anything, not even have a nice dinner together without being interrupted. We have both taken so much time away from work trying to keep her calm that we are scared to take anymore. She refuses to listen to reason or professional opinion much less ours. This is no way to begin a marriage and honestly I don't know how much more I can take. I have my own parents and family obligations and am spending so much time with my new in laws that I hardly have time for my own parents. This makes me feel guilty as the toc is ticking and they are also getting older. I want to be a good wife and support my husband but this is sucking the life out of us both but me more than him as he is a Mama's boy and he just wants to make it all better for her while I really just want to find her a safe place where she can be cared for properly. It has been recommend that she be moved to skilled nursing and her cell phone be taken from her and while I agree this might be the right move she is going to to absolutely FLIP out if this happens. How do I just back away from the responsibilities of caring for my in laws without being insensitive to them and my husband. I want to support him but this situation is aging me, exhausting me and causing me to have my own health issues. Too young to be this stressed. HELP!