How can I get additional caregiving help for someone who doesn't like stranges in her home?

Hi, I'm the sole caregiver for an 81 year old friend who has Alzheimer's, rheumatoid arthritis, cellulitis, diabetes, peripheral neuropathy, incontinence, macular degeneration, and vascular disease. She rarely moves out of the chair in her room, sleeps most of the day, and wants to talk at midnight and later, although she has sundowner's and doesn't know where she is or why she's here. She sees people who aren't there, picks at her arms and thighs constantly, spills everything, doesn't take her medications unless I stand over her, and wonders why her dead son doesn't love her any more. She's had two and a half toes amputated and is in constant pain from her RA, but is almost always cheerful and says she doesn't know what she'd do without me. My friends all say I should get help, but she's a very private person who wouldn't like strangers in the house and I'm not sure what they could do anyway. Any suggestions?