Thinking of my aunt Deirdre, big Gerard and all my cousins at this devastating time.
She added: Rest in peace, beautiful.
She urged anyone who knew of her final movements to contact police.
Following the tragic news, tributes were paid to the young girl from across Antrim and further afield.
Antrim councillor Roisin Lynch said it was a terrible tragedy and appealed for anyone with information to contact the police. I want to offer my sincere condolences and heartfelt sorrow to Shona s family and friends at this incredibly difficult time, she said. The whole community in Antrim has been taken aback and I know that people here will offer the family as much support as they can in the days and weeks ahead.