Mike,
Don't think, for a moment, that Lu doesn't hear you or know you're there. When my Mother was in her last 5 days and at a Hospice facility, the nurse told me Mom could not hear or respond. I held her hand and said "Mother". "This is Chris" She flinched and I knew she was somewhat responsive. I told her we (the entire family) were here for her, whatever "she" decided to do. Take books and read to her Mike. Play her favorite music. She's still your "Pal" Mike. She just needs you more right now, that's all. Hang in there Mike and please know we all care.
All the best, Capt. Chris