If you're close enough with her to feel comfortable doing so, please please please find a way to tell Anne. I've lived with the money-lying-and-manipulating type (and the simply money-irresponsible type) and she could still be totally in the dark about this, and it jeapordizes her financial security.
My husband is the seriously-money-irresponsible type. I basically had to seize his check book, debit card, and bank numbers when we joined our finances, and he was more relieved than offended. He really had no good examples about money growing up (I had to teach him how to write a check when we were in our early 20s) and he's now seen enough of how I run our finances that he can be trusted not to put us in the poorhouse.
If it turns out George is more money-manipulative, she'll need the heads up so that any income of her own can be put in a seperate savings account in case of a true emergency.