Do they have anything posted about reentry into the park and how its not guarenteed? If they do, its not there fault people don't read it. However, if there isn't anything then I agree with everything about the CM's should have gave a forewarning about not being able to get back in. For the future then, DL should have something posted near the exit about reentry into the park.
As far as requesting a full refund for not being able to get in the park.... I think that is a bit obsesive. If I go into DL early and then leave at 1:30, should I get a refund because I didn't do any more of the park? When you goto the park, regardless how long your there, a day is deducted from your pass, as it rightfully should be and is stated in numerous places. Now I understand giving them a half day pass for that is what they missed and were restricted from doing. But a full refund is a bit much. Just my opinion.
Oh and on the post that said that they should keep people counted as a guest in park even after they leave.... they you just created a bigger problem. You will stunt ticket sales, for the park will be viewd as "full" earlier on in the day. That is definatly not the solution. If the park was full and then half of them left, by doing this plan, DL would still have to consider the park full. How does that make sense?
I do also agree that for the mother getting the jackets, that was a bit much on Disney's part. They definatly should have let her back in. Although, to verify the story, perhaps calling the rest of the group to the front to verify she is with them. You wouldn't want a bunch of people claiming they were seperated only to get into the park. That could become a big mess.