According to her Starnow profile, she wears a size 9UK women's, which is like a 12US women's. It also says she wears a 10.5 US women's. I thought her who size was a ten US based on another profile I'd seen. She definitely has some huge hands.
Here's a quote: "Im a giant person. 5ft 11 1/2" with a big Finish potato farmer frame and big plates of meat (feet). People think Im teeny when they see photos of me and nearly die when then they meet me."