There was probably one moment in Dess’ life where she had a really, really bad day that made it feel like everyone had turned against her and she was absolutely worthless. Then Noelle accidentally does something that releases the floodgates of Dess’ rage and she absolutely tears into Noelle and says the most heart wrenching shit about her possible; the kind of stuff that’s only said to someone when you want to stab their heart with words and make them feel the worst pain possible. It wouldn’t be long winded or a rant either, it’d just be the sharpest dagger to the heart as fast and quickly as possible.
She’d at least have enough sense to instantly regret saying it, but the damage is already done. Now Noelle ‘knew what she really thought of her’. In that one moment, Dess likely irreparably damaged her relationship with Noelle because she couldn’t control her anger.