I am worried about my mother.

Am I interferring?

I am worried about my mother. She has been widowed now for coming up to 4 years and has expressed to me in the past that she finds getting upset a weakness. Something has happened to her in her younger years that I am unaware of, and I think this might be linked. She smokes and drinks a few nights a week and sits in front of the TV every night after work. I have discussed my concerns with her and suggested she sees a counsellor or speaks to her friends, but she feels like a burden. I have suggested activities that she might enjoy, but she doesnt seem to want to do anything. She appears fine mood-wise and doesn't appear to be very depressed. I might sounds as if I'm over-reacting but it's because I love her. I was thinking of mentioning my concerns to her closest friend, is this wise or am i interferring? Please help.