Browse to the Citrix Files folder in your File Explorer
You would right-click on the folder you want to give the other person access to, then under the ShareFile options section select "More Options > Manage Permissions"
Next, Click on Add People to Folder
In the next window, type the name or email address of the person you want to share the folder with in the "search existing contacts" field and double click on their name to add them.
If they don't exist you can click on "Create New User"
Confirm the permissions you want her to have are correct and then click "Done"