Extraordinarily Unordinary by Sian Webster (free novels to read .TXT) 📕

Casey Copsworth always knew she was different. She was in the "reject" group at school, she unintentionally stood out of the crowd, she was impossibly intelligent for her age, but most different of all, she wasn't from... around here.

Left on the doorstep of an orphanage when she was a baby with nothing but a letter saying "Keep her safe, she's not like you", Casey WAS different.

But when all around the world people start having "alien encounters", Casey's world gets turned on its head.

To make things worse, she's the only one who can stop them.