You have more chances to spawn her in caustic caverns, I’ve spawned her 6 times this week solo as I’m now after ninja rose siren skin, all I’ve had is norfleets. It’s a struggle. twice outside main entrance just aggravate them, then let them fight with crystalic or whatever its name is and stand back somewhere, kill them if no verm after 10 minutes. Then move to infested warehouse I can spend 40 minutes in there, just running around as the varkrids keep coming it’s a good place. 3 spawns in there. Then round to tunnel entrance kill first threshers run to tunnel entrance aggravate the varkrids till they pod to badass then bring other threshers into game and watch them kill each other. In my experience when a super kills threshers it pods to ultimate (this is my experience) then verm. Had one spawn there, then into the tunnel an repeat the aggro. Try keep an eye on what’s not evolving in set evolve times and kill them. Also in my experience if u kill a few that haven’t started to evolve the little ones start podding. It took me 5 spawns to get the kawaii killer head so patience is a virtue on this one.
If u was ps4 I’d give u one