When I interviewed at UHS, there was a girl in my group touring the school that said she didn't have an interview, but just wanted to tour and visit the school. The ambassadors at UHS lead the tour, and they are a great source of information. Maybe you can talk with them, and get more information. Maybe you can come and just tour.
Everyone I talked to at UHS was so friendly. Perhaps if you made the trip in person, and asked to speak with key people in the Admission's Office, it would help. Find out why your interview is on hold, or just make your strong interest known.
If you are in school this year, make sure you write letters updating your file with new information, updated transcripts, other activities you are doing. The transcripts update would be an espeically good idea if your g.p.a. is on the border.
It's still early. I'd bet you still have a good chance. I received a telephone call from one school to schedule an interview on July 30 when I was applying because so many admitted people decided to withdraw at the last minute. Good luck!