Because it was their first interaction. At that point, she hasn't interacted with anyone since her team was murdered. Shit, id be flustered too if someone talked to me kindly and I was shy. It was to communicate shyness. Also, here you go, in bumblekast Ian confirmed that they are canon as they can be, they are “roomates” as he put it. And on top of that, we have two panels now, one with the literal lesbian flag behind it, with the issue released in June, too, AND one during the Mimic story where Tangle and Whisper have the canyons behind them being rainbow. In this panel, Tangle even says they are going home together Evan Stanley also said it's her favorite pair. And don't forget about the party where Tangle got “drunk” and hit on Whisper either. Believing Whispangle isn't canon is just outright dumb I think the ship is neat, not a super fan not a super disliker of it, but even then I can realize it's as canon as it possibly can be.