It would be insane for her family to not take her into their home and take care of her, which unfortunately the US doesn’t do as much as other cultures.

So right now she is independent, but under UBI she has to beg her family? Is that what you call a success of UBI?

That's just income redistribution from the most vulnerable, right wing would love this.

She is not really independent right now. There is no way a grandma can live comfortably in one of the biggest cities in the world without massive subsidies in the form of rent control, for example.

The combined disposable income of an entire family should be enough to afford housing for one great grandmother. UBI probably won't help or hurt her at all.