It isn't impossible... I fell in love with someone at first sight, and I still love him even though I know that I don't have a chance with him. But I would be careful how much you say if she is uneasy. That was where I screwed up most. I said too much too soon, and it overwhelmed him because he's been hurt in the past, and he's been alone for a long time because of it.

I hope that is works out for you. It may seem like you need to tell her everything right now, but you need to take her feelings into consideration too. Just try to be patient, and be careful.