Store bought desserts for a friend?

Hello r/FODMAPS! I'm new to the "x-free" diet scene so I'm not sure if this is the right place to post this, but this seems to match what my friend has. She just informed us recently that her doctor told her she can no longer have dairy, gluten, or fructose in her diet. My brithday is coming up and I would feel bad for serving food she can't eat. So I figured I could find an alternative dessert she can have during "cake time" so she doesn't feel out of place. Unfortunately, this party takes place immediately after my finals so I don't have time to prepare anything in advance. Is there anything I can get from the store (even individual ingredients I could throw together in 5 minutes or less) that would be dessert-like?

Thank you in advance!