Cain may have a better chance in the 800m since only 3 women have the A standard (& they all made it today - Brenda Martinez, Alysia Montano, & Cain) & Martinez indicated she may not go for the 800, even though she has the leading time so far.
The A std for 5k is 15:18.
Hard to say whether she could make it or not since she hasn't run a 5k on the track yet. But, given her 3k & 2mi performances indoors, 15:18 is definitely within reach.
By comparison, Abby D'Agostino ran 9:02 for a 3k indoors last year, then 15:19.98 outdoors.
Kim Conley ran 8:56 and 15:14 outdoors last year.
Julia Lucas ran 9:01 (indoors) and 15:08 outdoors last year.
Cain ran 9:02 indoors (& probably a bit faster if her 2 mile record was converted), so could challenge 15:18 if she has competition who can run faster.