When should I call Hospice?

My mom ( uterine ca plus Alzheimer's ) 5'7" weight= 102 , has no pain, bleeding, and sleeps 90% . Labs WNL. She has a DNR. She said " If I don't eat, don't feed me." We have to wake her up to help her eat . She eats very little and loosing 10lb over the past 2 months. Becoming weaker and uses a walker to visit a neighbor down the block with supervision of caretakers. Gets SOB with walking and usually sits down after 15 steps. Had a syncopal episode in church once and they gave her OJ and then continued. She does not want any more tests done except blood test which are WNL--- even though she is vaginal bleeding serosanginous fluid. Has had endometrial cancer dx 5 years ago and recurred 2 years ago. Now refusing tx. Unable to preform ADLs by herself due to Alzheimer/dementia. Denies pain. Takes a blood pressure med, thyroid med, and memory patch.