My 94-year-old grandmother lives with me. She will only let me wash her hair every 10 days or so. She loves to go out but I tell her that she isn't clean and a huge argument ensures. She has Stage 3 Dementia. She is physically capable of taking a shower with my help but refuses to do so because she hates when I tell her what to do. She does take a sponge bath each day but only washes important areas. How can I get her to take a shower? I have tried a calendar and other sneaky ways to encourage her but she resists what I try because she says she hates me. It has been 3 weeks since her last shower.