Here's how you ensure you're eating enough.
1) Set up Sparkpeople for a reasonable weight loss goal per week. For you, I'd suggest about .25 lbs (max, .5).
2) Enter your ACCURATE calorie burn in your fitness goals. If you're running 5 miles a day, 5 times a week, that means you're burning roughly 400-500 a day (rule of thumb is 100 calories per mile, but you'll likely burn less if you're smaller.) So for you, that's 2500 calories a week.
This should get Sparkpeople to generate a range for you. You can also do the calculations yourself here: www.sparkpeople.com/resource/calorie_calcu
Also keep in mind that the closer you get, the harder it is to lose. THe last 5 lbs may be vanity pounds that your body doesn't want to get rid of! A better measure of your progress would be your body fat percentage.