UPDATE:
Not anymore.
We went over today for a visit. MIL hinted at it again. I nipped it in the bud. I was polite and explained that I was really looking forward to doing Disney my way. Getting up when I wanted, as early as I wanted, staying out until the park is closed, eating what I want, when I want, etc. The hinting continued just a bit and I followed up by saying,
"sometimes I think it might be fun to have somebody with me, but I think the most important thing in that decision is having somebody with you that you have things in common with. It would be really difficult to hang out with somebody for 9 days where you really do not share interests, conversation topics and such. I would hate to have somebody come along for the sake of just not being alone and get to the point where you dont want to talk anymore....or worse, come back and there be friction between you because you have nothing in common and you didn't enjoy the company. That would be horrible and it is not worth it." At that point she got it!!!!