My overall GPA was 3.93 when I applied (3.95 now), Verbal: 168, Quantitative: 155. My experience includes volunteering for 2 months in orphanages in Mexico (including a special needs home), a semester abroad in Spain, research with two professors (just experience, no thesis), 25 shadowing hours, president of the Spanish club, participation in many language conversation activities.
As far as how fluent, not a native speaker. I started learning in high school, but didn't speak any Spanish until AP Spanish. I worked and work very hard to find opportunities for myself to learn. Compared to other undergrads in my department, I am more fluent. I lived with a Senora in Spain, who was very demanding, so that helped with the learning process, believe it or not. I also had two language exchanges in Spain. I currently host conversation tables with my club and attend a Columbus-based Spanish meetup.
UT Austin does not have an interview, they determine fluency when you arrive, which means you have to accept without knowing you're in. They are generally not very student friendly from my experience. They do not decide funding until after you accept.
Indiana U has been the opposite, very helpful, and Dr. Anderson was willing to be meet with me before I'd even applied. The interview consisted of general questions about your Spanish experience, attempts and advice for learning Spanish, etc. It was not too intense, but certainly you had to be on your feet and ready. I received a packet in the mail about a week before when I was expecting it including my admission, acceptance to STEPS, and funding.
Let me know if you have other questions, I'm always open to helping out.