Does/did your LO do this? How do we handle it?

E has been very challenging today, pushing boundaries and testing limits constantly...... but the really stressful part was that she seemed to be finding the whole thing very, very funny. She would do something she isn't allowed to do (trash plants in the garden for example, or drink her bathwater), I would ask her not to do it, she would do it again, I would warn of consequences (having to come in from the garden, loss of her beloved Peppa Pig foam soap), she would do it again while staring me straight in the eye and laughing, consequences would happen and then we would have a meltdown on our hands (crying, hitting, biting). Then, five minutes after she has calmed down and apologised, she is misbehaving again, deliberately (with that glint on her eye). Near the end of the day, DH lost his shit with her and she was loving every minute - he ended up throwing one of her toys in the bin and even that didn't seem to stop her finding the whole thing rather hilarious; he told her she could earn it back if she was good until the end of the day and, 5 mins later, she was digging up a flowerbed using her shoe as a trowel.

Any ideas? I'm going to put her on Ebay!