First of all thank you taking on being her caregiver. It is not an easy journey.
Since she is under hospice care they can be a great help to you. They can help with bathing. Some hospice agency will come daily to bath and other may do it less often. Accept any care you can. You need to keep her skin in great shape to avoid skin tears. My mom's hospice carers mixed body cream about half and half with petroleum jelly and applied it all over her body. Mama's skin looked beautiful. If she is on oxygen do not use petroleum products. If she is bedridden reposition her every couple of hours to avoid bed sores.
There may be a time your grandmother may have to wear diapers. That was a hard task for me… pre-hospice care. I had watched the nurses in the hospital and that helped. I watched many youtube videos on it too. I finally figured out what worked best for me and her.
Take advantage of a hospice nurse coming to visit your grandmother. Do not hesitate to ask her questions. Your grandmother may become unable to eat or drink. She may take ice chips or popsicles for awhile. The nurse can supply swabs to use to help keep her mouth moist. Have something on hand to moisten her lips.. they will dry.
Dealing with all this was hard for me too. Talking with her even after she could no longer speak was important to not only her but to me. I thanked her for everything I could think of … including the tea parties, fixing my Humpty Dumpty doll and making my clothes. Little things that were very important things to me.
My prayers for you as you go through this journey.