mackenzie moretter , who has a rare genetic disorder called sotos syndrome that has delayed her development , which makes it hard for her to socialize , told her parents she wanted a ` big-girl party ' for her tenth birthday .
this meant inviting friends , but after her parents sent invitations to mackenzie 's classmates and heard no response , her mother jenny moretter took a different approach .
jenny moretter went on facebook and posted in a few local groups asking families with girls mackenzie 's age to stop by their family home on saturday - and the response was overwhelming .