This sounds more like ship-teasing then confirming Fluttershy has a crush on Discord. Kind of like how you see from both tv shows and real life sometimes when someone teases a possible relationship like "oooooo, you have a crush on him" despite not being true and they never became a thing. We also got to know this is a cartoon, where if a show's staff love their fan base so much they will do things that they will like but it doesn't mean they will make those things canon



What I am saying is, unless this actually comes out of Fluttershy's lips and she means it, we can't confirm this as meaning she likes Discord this way. TBH, I find more reasons to how they can't possible be a couple than they can.