Colorado's $13 is the standard sales tax refund for a filing as a single person. Near as I can tell, you get that even if you paid $0 in state taxes. (My daughter got the same thing. She had CO income, not enough to pay taxes, but enough to get a W-2. I still wonder if that is a TurboTax mistake or really the CO rules.)
Colorado's filing rule is simple: if you have to file a federal return, you have to file a Colorado return.
For state taxes I just use TT to fill in the forms and then print it and mail it in, and skip the TT state filing fee. If the version you bought doesn't include one state module, just download the form from the state. For CO it's mostly a trivial exercise in copying fields from your Federal 1040 and saying no to a ton of optional stuff.
Given your situation, the real question is whether you have to file a Federal return. If you have sizeable scholarships that cover more than just tuition, you might be required to file federal. (Any portion of scholarships that pay for room & board, books, etc., is considered taxable income. TT will ask specific questions about this when you put in your 1098-T.)
