I can think of 2 scenarios where she would be able to see the information.
1. She could join wikitree as a family member. You can read more about them here
2. You can change the privacy on your account by going to the privacy tab. There 2 different options for showing the Family Tree. However profiles marked unlisted or Private will still not show any information.
I would recommend the easier method being the 1st option of which you could add her to the trusted list so they can see all the details. You can read more about trusted list adding here
Hope this helps.