CliffNotes:
You ask her out. She says yes! She changes her mind and tells you she's bi. She sends mixed signals, but the answer is still no. You visit her/"JUST ORDERING FOOD" and make it awkward.
She means no buddy.
Try this approach instead. Jokingly and casually mention "you led me on! what a tease! you owe me one!"
Casually, as a friend. she will buy you a drink, whatever. ROOFIES. DONE.
