It was not difficult for the young teen to mistake voices, especially when she was mostly asleep. Seeing as Edward never really had many females in her life outside the one, that is the name she latches onto.

"Sleepy-sleep, Faye-Faye! Nappy-nap, Faye-Faye!"

The teen flops over in her sleep, grabbing onto Tifa's leg. She was still oblivious to her new locale and the fact that she was covered in seawater.