was it just on that day that there was big free play??
sometimes what might seem as free play isnt its a structured play but children get the choice to participate. i think its hard to see what really happens in a ccc unless your there for the entire time they are open. most ccc cater more for the fulltime children then one dayers, as in one day might be lots free play(also some kids need that on certain days) but the next day they hardly go outside. so over the week they get a huge mix of things. but your dd being in one day might not get to see all aspects.(iykwim?)
your dd playing or not playing with the older groups i dont see as a big issue she to will learn to say no and to respect when someone else says no in play times. you cant force others to play with her just because you think they should.

take her back but give it about 3 weeks before you make a desicion!