Can I make a retirement fund for my mom?

My dad passed away this year and I am one of his beneficiaries. My mom doesn't have a retirement fund and I would like to create one for her using some of the money I got from my dad. Is that possible? I would just give her the money except she has a habit of spending money really fast, so I want something that would pay out the amount to her monthly. But am I allowed to do that on her behalf or does she have to set it up?