Keep at it & do your TER homework. Just a hunch BUT...

if you've called/emailed as many girls as you claim with zippo responses then you're doing something WRONG in your calls or emails.  Do not ask what specific services she offers or about pricing on the phone or in email.  Be polite and give good references.  In this horrible economy, many girls have business way down. No response from many contacts means YOU are fucking up in your contact style.

Aphrodite Companions runs a lot of gals through NYC and many are Latina.  There's also Independent Latina Escorts, although they don't have as many girls.