16:00.00
By the USTFCCCA conversion factors, her 9:38.68 two mile converts to 15:41.23
Her 9:02.10 3k converts to 15:52.28
15:48.91 is apparently the American HS record (Emily Sisson), so by a simple conversion of Cain's recent times she could be challenging that record.
However, I think she's only run 5000 a few times and only in cross country, most recently at the NXN final where she lost to Sarah Baxter by about 4 seconds. Baxter seems to be able to run about a 16 flat 5k. That's about what I would expect from Cain in a 5k right now, relatively a bit slower than her 3k. I think she's better adapted to the shorter distances.