It all depends on your personal experience. Some women have known nice guys with tiny appendages, and some women have known clumsy selfish guys with big units who were lousy in bed. She was probably looking for whichever type she hadn't had before.
Of course, maybe all she'd known were inept pencil-dick jackasses. Again, I didn't ask, but I'm starting to almost wish I had. I could've just said, "How low was the bar?"