Angela,
The LR hype insists your training has been deficient, despite the fact that you are an NCAA champion on moderate high-quality mileage. I encourage you not to cave into the rather mindless insistence that high mileage is what you need to succeed at the world class level.
I posted earlier this week that on the men's side, the US record for those runners training 80 or less miles/week are actually rather impressive. Lagat, of course has run faster than everybody 1500-5000 with much of his career's training in the 50-60/week range. And how has he manged this? Quality running. In truth, you've been training just about as much time each week as the best US distance runner.
On the women's side, the 1500 - 10000m records are held by women averaging closer to 50-70 miles/week annually. Slaney ran 820's for 3000m off of about 60 miles/week. Huddle is not slogging out 20 milers at 7:30 pace. Flanagan improved her body composition, found a way to stay healthy, hammered more than ever and even incorporated 20m sprints. Volume is one factor in training, not the only factor. There is more likely, absolutely no reason that you need to make any major increase in your workload. Your real focus should be to drop your 800 and 1500 capability, and improve the overall quality of your overdistance, which together will allow you to run regularly in the 14:40 range at 5000m.
best of luck, Angela
dsrunner