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Sen. Dianne Feinstein's daughter has power of attorney over her
It seems most people don't understand what power of attorney means. It gives her daughter the ability to make decisions* on her behalf, yes, but doesn't grant any sort of conservatorship over her.
It's an intelligent move, especially when a person gets older, to grant PoA to someone you trust. It means if, for example, you're in the hospital, that person can still do things like pay your bills from your accounts.
EDIT: *legal, personal decisions - not senate votes. It doesn't give the daughter any right or ability to do her job.