I'm sorry to hear you're going through this, Orsina. Hugs to you.
I think the most important thing you can do, for your mother, and also for you, is to be very proactive in her care. Feel free to question and insist on explanations from the hospice personnel.
You have the right to be certain that they are giving her the kind of care she would wish, and to know that she is as comfortable as she can be.
I lost my mother 3 years ago (story above ^^) after caring for her in her home for 10 months. The last 2 months with Hospice was wonderful in our case. My mother chose not to have food or fluids in her last days. When we discussed it with the hospice nurse, I almost fainted. However, she explained to us how the body works when it is dying. Usually organs start shutting down, one after another. In my mother's case, she was starting to experience nausea, vomiting and stomach cramps, with a low output of urine and bowel movements.
My mom refused food or water for the last 16 days, though I did have a spray bottle of water whenever her mouth felt dry. She died on day 16. I know it sounds awful, but she was lucid, happy, and in no pain or discomfort at all. In fact, the day she died, my sister and I were out in her yard with her while she planted tulip bulbs for spring.
My sister and her daughter went home, and mom died while we were watching "House Hunters" which was a favorite show. She just fell asleep, her breathing slowed, and then stopped.
I hope you will be strong and voice wishes for your mom's comfort. Whatever the outcome, you'll be glad you did.