I don't see anything in the scra that would allow you to require the tenant to continue the lease until some date of your choosing prior to the date of deployment. It simply states the tenant must provide proper notice (how delivered). The termination date is the last day of the month following the next monthly rental payment due date. In other words, if rent is due on the first of the month her last day of tenancy would be aug 30.

That will get you a couple extra weeks but I think that's all you're going to get.