All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
In our view, you should continue in your project of marrying this woman especially that she became attached to you and cannot bear separating from you, as you mentioned. Even if she committed fornication and then repented, it is still permissible for you to marry her, and thus this is more applicable in her case since what she committed did not go as far as fornication. Furthermore, this happened in the past, and now she became righteous, so seek the reward from Allaah by intending to preserve her chastity.
Finally, we hope that you will not consider the whispers of the devil who want to make you unhappy and miserable.
Allaah Knows best.