I'm actually a guy with a MAJOR foot fetish and limit my hobbying to exploring it and nothing else. Whether you know it or not, they actually have foot worship parties. I know they have them in DC. That might be a good place for her to start. She would be around others, both men and women, so she wouldn't be alone. Everyone there either has a foot fetish, or caters to them, so she would have plenty of people to learn from. Contacts are also made to have longer, more personal worship sessions outside of the parties.
There are actually foot worship agencies as well, although I don't know of any of those in the DC area. Anyway, I'd be happy to email you some links if you want them.