DD graduated from college this weekend (YAY

). She has been accepted into a grad program with a fellowship /assistantship at her 1st choice school to begin in early July. She announced this weekend that instead of starting her program as planned she is going to take a year off from school. The university will allow her to defer admission for up to 2 years, so that will not be a problem, but the fellowship/assistantship will not hold her job. She also does not have any firm plans for what she is going to do for this year (no job, housing, etc.). While I understand wanting to take a break, I am a little concerned that she is hurting herself long-term. My wife seems absolutely fine with this and immediately started talking about DD coming back to live with us and how it will be great to have a girl in the house again (our 2 younger kids are boys). Somehow I don't think this is going to go well... how do I communicate this to them without them getting defensive, I really think they need to think this through better.