She was a maid at the hotel where Rita Bennett worked at the front desk. Apparently, Rita considered Yelina a friend. Rita even stole her obnoxious neighbor's neglected dog and gave it to Yelina's nieces in order to give it a loving home.
Yelina was engaged to a Cuban man named Ernesto Rodriguez who was attempting to enter the U.S. Unfortunately, Ernesto went missing and Rita asked Dexter to help find out what happened to him. Dexter met up with Officer Gerard to research the issue of smuggling. Soon, Ernesto's corpse washed up on shore and a heartbroken Yelina identified her late fiancee's body.
Dexter learned that the "Coyote" responsible for smuggling immigrants (including Ernesto) was Jorge Castillo. If they couldn't pay a release fee, Jorge would murder them and dump their bodies at sea, after which their remains would often wash ashore. Jorge met his demise when Dexter killed both him and his wife.