It is her!!

"Call William and tell him that his sister is fine. However, don't tell him about what happened. Kyra is safe now and it doesn't matter even if they know." Oliver said. 

He didn't want her family to know because he is scared. Scared that they would come and take her back to London and never allow her to step into America anymore. 

Jennifer shared the same thoughts. Moreover, Kyra fell into the river by accident. She didn't intend to do anything extreme. 

"Got it. I will tell him that we found her at the river side and she was taking shelter there for the time being as it started raining" Jennifer said. 

"Tell him that she couldn't contact us because her phone battery died." Oliver said.