It's pretty simple. First, take your Barb-dough and carve an expression of complete agony into her Barb-face.
Then put her in a scalding hot oven and bake her alive because she HASN'T BEEN THROUGH ENOUGH ALREADY.
Now, abandon her like your name is Nancy Wheeler while you go off and make some dumb onion soup/sleep with your boyfriend.
Then just plop Barb right into the soup, because fuck it.
Now cover her poor, dead Barb-face in cheese.
And to top things of, casually take a BLOWTORCH AND BURN HER FACE OFF.
Oh, and obviously find some time to make a replica of Barb trying to climb out of the pool where the Demogorgon killed her because you, somehow, need to make this EVEN RUDER.
RIP Barb, you look delicious and we will avenge you in Season 2.