My 9 year old daughter has returned from 2 weeks at sleep away camp and is having meldowns each day at home.?

She had a great time at the camp! No complaints and we received great feedback from her counselors that she participated in activities and made new friends. But, since she's been at home, she seems every day to act out by having meltdowns which last at least 1/2 hour or more. Does anyone have any insight into what she might be feeling since she's returned from sleep away camp?