Waitlist Chances?

Hi, my daughter recently was waitlisted to her number one prep school. It has about a 20% acceptance rate and accepts about 100 kids every year. We sent in a letter of continued interest. She has a 98th percentile SSAT, a 4.0, and tons of extracurriculars. Is there anything else we can do/what are her chances of getting in off the waitlist?

Everything anyone needs to know about wait lists is covered on this thread:

http://talk.collegeconfidential.com/discussion/comment/22631842/#Comment_22631842

Start with post #2507 and on from there.