'Antonia Ramos' is the *character's* name (and the name of the episode), not the actress. And I don't think that the woman in the red sweater is the Antonia Ramos character. Given that the episode's title character has, so far, always been the same one that appears in the "So tell us what you don't like about yourself." part of the preview, it's most likely that 'Antonia Ramos' is the dark-haired woman in purple (posted above).
As for the post about how practical it would be, I don't think they use the same girls over and over. I got the impression from the preview that it was a one-way job. The drug dealers find some Colombian girl who dreams of going to the U.S. and arrange to get her paperwork to get into the country. In exchange, they bring the heroin in with them in their implants. Then again it is just a TV show

It does look to be some nice viewing. Why did my ReplayTV pick this week to go kaput? Damnit!!