Hi P! Also see: https://www.wikitree.com/wiki/Help:Adoptions_and_Multiple_Parents.
If she wants to use our DNA features, she'll need a profile she can connect to her biological family.
I'm adopted so if you have any questions about profile set-up, etc, please feel free to message me. Thanks!
You can also use the very nice adopted template found here:
https://www.wikitree.com/wiki/Template:Adopted_Child