Do I say something, or just let it be?

This may seem trivial, but my 88 year old Mom, who is legally blind is not vain, but still has pride in the way she looks, which I feel is a good thing. She still makes sure shes does her hair and makeup every day. However, because she can't see, her eyebrows and makeup are always globbed on and it looks like a 2 year old was playing with her Mommy's makeup. I've gently offered to help her several times, but she declines my help, and I haven't been able to bring myself to tell her that her it's kind of a mess. I don't want to hurt her feelings or say something that would make her give up on keeping up her appearance. Does anyone have any suggestions on how I could help Mom with this? PS- I also tried getting her a super-magnified mirror, but it doesn't help.