In my experience its best to leave the ball in their court for as long as it takes. If they never bring it up again then I think you have your answer. Who knows, the might, but bank on it taking a long time. If she didn't even know what poly is and starts researching then she will need time. They might ask you for more info though so be ready for some links, books and some idea of what you are looking for that doesn't include them. That way they will know that you are not necessarily looking for them to be your poly dream dynamic... in time they might bring it up and be interested... but its way too early to tell yet from what you have written.
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