I'd say have Scott meet ur Mom too, and then allow them to talk in private, then wait a week and see how she reacts. If that doesn't work I think it might be a situation where u need to wait it out on her for a bit and then later on she may have second thoughts and allow u to stay later then. Does she drop u off there to begin with (like she comes home from work, drives u over, then waits/shops for an hr and then wants to go home right at end of class)?