Thank you all for your responses so far. Yes, Brownies is a part of Girl Scouts. Yes, there is some controversy about the organization as a whole; however, I would like to leave that discussion for another day. The camping trip is for the entire council not just her troop. I did not think to ask if their would be a priest on hand for Sunday, so I will inquire into that.
As for Sunday afternoon: Yes, there are many Latin Rite churches in town with afternoon masses. However, I would most likely not be able to take her as she would be with her mother who has sadly become indifferent to the faith since she left.
Also, I believe most of the responses have been from the western viewpoint of mass obligation. I intend no offense, but I deliberately posted to the Eastern Catholicism forum for an eastern point of view. Those of western spirituality are more than welcome to share their thoughts, but I would really appreciate some (name removed by moderator)ut from those of the eastern persuasion.
God bless.