How is Letty alive in Fast and Furious 6?

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Letty Ortiz (Michelle Rodriguez) appears in a cameo at the end of Fast Five. This Letty sighting is important for a number of reasons beyond her death scene in Fast & Furious. We watched nearly two Fast and Furious movies without Letty. Dom is sure Letty is dead.

Dom has already moved on with a hot Brazilian chick who is the Brazilian agent from Fast Five. Letty is dead, which is what we are supposed to believe. Fenix killed Letty in Fast & Furious. Fast Five has a twist ending that shows us that Letty is alive. Fast & Furious 6 explains how Letty survived the crash in Fast & Furious and why she turned into a criminal working under Shaw.

Beware that Fast and Furious 6 spoilers are below. If you haven't watched the racing movie yet, then avoid the spoilers.

***Fast 6 Spoilers***

***Spoiler Alert***

Fast & Furious 6 opens with Brian and Dom racing along the mountains to see Mia after she gives birth. Next, we see Dom in bed with a partially nude Elena (Elsa Pataky), the beautiful Brazilian agent who is actually married to Chris Hemsworth in real life. Dom hears a noise on the balcony. He investigates the sound, where Hobbs appears. Hobbs asks Dom how life is going for a retired international criminal. He tells Dom that he needs his help. 

Hobbs hands Dom a yellow envelop that changes his life. Letty is revealed to be alive in the surveillance photo. The questions that ask where is Letty and how she died are answered in this one scene.  The inciting incident (catalyst) explains to us that Letty is alive and that she is involved in a criminal network. The Fast and Furious 6 movie plot now propels forward. 

Letty is alive. She has no recollection of previous events. Brian goes undercover as a prisoner to question Braga, where he learns how Letty survives the car crash. Braga tells Brian that Letty crashes out on a road. In Fast & Furious, we remember Fenix shooting at an injured Letty while she is trapped in a wrecked car. The car explodes, killing Letty and setting off a chain reaction of events to follow. 

Braga reveals that Fenix allows Letty to escape the wrecked car. Fenix points his gun away from Letty, shooting the wrecked car that creates an explosion. The explosive blast projects Letty down a hill. Letty is admitted into a hospital in which is diagnosed with amnesia. She loses all previous memories. 

Dom wants to help Letty find out her true identity. He never wavers from family. Letty survives Fast & Furious. She runs with the Shaw crew, a decision she makes after the antagonist claims her at the hospital. Her fragile state made her vulnerable. 

Letty is alive in Fast & Furious 6. Two external plots motivate Dom and company to rescue Letty and take down the Shaw crew. Have a fast ride watching Fast & Furious 6!