Does anyone have experience with obtaining guardianship, and how to do it?

Hello! My 94 year old mother, who is living independently, calls me up with some sort of problem daily. Such as how to use the microwave, how to use the phone, how to email, etc. I see her memory failing a little bit week by week. She refuses to go into a retirement home. So, I am thinking that I will probably need to become her guardian and just put her in a home where she'll be safe. And the homes we've looked at, supportive living Medicaid homes, are actually very nice. I feel confident she would be better off in the home, safer, happier in the long run. But she refuses. So I'll have to become her guardian and just put her in a home.  Thanks!