If there's a danger that she'll choke if she tries to drink water, she might still be able to suck on ice chips as long as she is sitting up. Check with the hospice nurse. If she's in such an opioid fog that even that wouldn't work, she probably doesn't even notice that she's thirsty. If she's really decided to check out, there's a good chance that the nurse is keeping her well under. You can definitely put some lip balm on her lips, though.

Love, Columbine