Would it be okay if I told my moms friends doctor about her alcohol use?

My moms friend who lives with me has a lot of trouble walking. It was really bad a couple weeks ago, so we took her to the hospital. They did some tests, and there was a lot of alcohol in her blood. The doctor said that the reason she can't walk well is because of her long term alcohol abuse. She can't drive, and she is going to see her doctor tomorrow, so im gonna drive her, and meet the doctor with her. I doubt she'll mention her hospital visit, but I think her doctor needs to know. Would it be appropriate if I told him?

Would it be okay if I told my moms friends doctor about her alcohol use?
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