Revealing mistake: When April first takes the photograph of the symbol, she actually has the camera in selfie mode, you can see her face on the phone.
Continuity mistake: After the turtles, April and Vernon escape from the Sacks compound in the 18 wheeler, the truck then get stuck in the snow. When they realize they start to slide backward down the hill, Vernon guns it. But then they show the wheels spinning on the Freightliner Argosy Cabover with a single axle. Next shot goes to inside the cab and then back to outside the truck, and it's back to a dual axle truck.
Answer: She was trying to send them away to save them from the experiments. The first place to search if some experimental animals get lost are the houses of the people that are involved.
Anastasios Anastasatos