I'm having a hard time getting my mom to wash her hair. When she has a shower at the nursing home she'll have a shower but not do her hair. If I bring this to her attention she'll tell me "I did it a couple of days ago", or "I'll do it tonight or tomorrow morning" and when the time comes she forgets that she said this the day before. She doesn't think her hair is that dirty. If I ask her to do it when I'm visiting with her she says she doesn't want to do it when I'm there and waste time. It is really hard to get her to agree to wash her hair. Any ideas on how I can handle this situation??