You are awesome in your efforts to help your Mom. But in one post you said your Mom knows she needs the CPAP but is afraid. There are so many "maskless" options now, she NEEDS to try.
You can't help your Mom if she won't help herself.
We often see people on Connect who are reluctant or afraid - sometimes that issue needs to be addressed before healing can begin.
Since she is going to Rehab, maybe they can get a counselor, therapist or social worker involved who can help HER work through this.
Your Mom probably really wants to get well, but is afraid - rehab is a lot of work, and requires her to make changes in her life that will be hard or that she has resisted in the past.
Hang in there, we're here for you!