Shade pretty much gets Flash-like powers while she's in her own Aura anyway, so they'd be on an even ground when it comes to that. If this were an MMORPG, think of Shade as a raid boss. Not impossible to take down, but there's no way to do it alone, and you're going to need teamwork and coordination to overwhelm her.
So yeah, don't go preparing the casket and the flowers already. They may not offer refunds.
So yeah, you're going to have to walk into the dragon's cave to take down the dragon.