That is a tough spread, and you're right that the pretzels were an awful choice. If you calories absolutely must be that low (and those are extremely low for someone even lightly active at your weight, who isn't post-menopausal or dealing with metabolic dysfunction of some sort) they must all count! Thisis where the 'maximize the bulk' game comes into play. No refined crud, no sweets, no 'junk'.
You can eat plenty of food throughout the day for 1300 calories, but we're talking things like pistachios, celery, turkey breast and cheese cubes, half a grapefruit, 1/2 cup of yogurt with some nuts, etc. There isn't much room for both satiety and empty calories when your stretch is a 5-11 spread and your calories top out at less than 450 for each major meal.
I agree that planning your day out in the morning with something like MyFitnessPal or Loseit is your best bet. Picking foods that go a long way and are easy to bag and munch (like pickles
) are going to get you through those hours with the least hunger and the most time spent actually eating (if the desire to snack is what you struggle with, play into that and not against it!).
I wish you better for tomorrow!