I have found little point in trying to clone non-GF beers as GF, just clone the style. Casanova has given you two good attempts, let us know how yours goes. If you can get her to like what you make, you may very well have the best GF beer I would have ever tried. In other words, you have quite the task ahead of you.
Mothership is a fairly standard witbier, you should be good to go with something like the above two recipes.