And the woman who I mentioned about the thank you is going to write me a rec letter for her house, and she said she would also forward my email to some people that she knows, so I feel that since she is doing that, even though it's not a hige effort, I should still send a thank you note. Thanks again, ladies

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Absolutely, in that case, a note is appropriate. (I didn't understand that from the first post; thought she might have just answered a couple of questions for you via e-mail.) I agree with the suggestion to e-mail her for her address.
Good luck!