Assign Gainsight License in Sandbox

Hi. we have a new person that will handle Gainsight, and I assigned her a license in Production. We don't want her touching the data in Prod until she learns the ropes, so I had to create her in our full sandbox because we're in between refreshes. When I tried to assign a Gainsight license in the Full sandbox, I didn't see the Manage Licenses link under the Installed Packages section like I do in Production. Is there a way to assign licenses in the full sandbox, or do I have to wait for a refresh?

Thanks,

Joe