Ditto waiting. The exact same thing happened to me. My agent sent my ms to one editor, she wrote back and said it totally wasn't her thing at all, however she thought it might be right up the alley of another editor she worked with. A couple of months later my agent called to tell me that the second editor had made an offer for it and the sequel. So, the fact that the first editor who read your ms didn't kick it to the curb immediately is extremely good news! Basically she can see that the writing is solid, but since it isn't her "thing" she can't judge the market. Good luck, and I would suggest waiting at least 3 months before sending a polite note.