My mom , 91, is in asst living. I went to visit her yesterday and she was sleeping on her rocker. I talked to her and it took her about 40 minutes to wake up. Tonight I called her on the telephone about 3 times and let the phone rang many times. Phone next to her bed. She did not wake up till a caregiver went to her room on my request. My mom does not have hearing problem nor she is taking new meds. Is this normal not to wake up when somebody talks or phone rings? Or is she becoming comatose?
Even though you say your mother doesn't have a hearing problem, I wonder if she has less hearing in one ear compared to another, thus if she is lying down on the bed on her side, her good ear could be on the pillow... thus she can't hear anyone nor the telephone ring.
So, just chalk it up to being in her 90's.
You might want to have a doctor check her out, but it's probably just being 91. Is the ASL place comfortable with her being like this or does she need another level of care?