Zero.
1. Who's paying for her F-1? You?
2. Colombianas are notorious for overstays in US. Embassy is just going to see this as an attempt to jump to US and stay. I see them crying on planes from Bogota after denials at US embassy Bogota.
3. Spend more time with her in Colombia before making any commitment. Hat-off moment: Tell her to study English on Duolingo and that you'll be permanently moving to Colombia. See how long the relationship lasts and then make decisions from there.
https://www.facebook.com/watch/?v=390144750283165