5:06/10:39/17:38.
And just because she committed doesn't mean that an unrecruited girl would necessarily be allowed to walkon if her PRs were 5:00/11:20/19:00. The question was the slowest that a girl could run and be allowed to walkon to any team. The referenced girl has nice XC and 5:06 and may have been recruited for the past 2 years. Or she may have a 36 ACT and the coach gets a bonus for a team with GPA over 3.5. I stand by 4:50 as the absolute minimum to guarantee a walkon spot anywhere.