**** this is dumb.

Spawned one after approx 100 kills. She run away unfortunatelly, so I tried to kill more on same run. I killed approx 350 and she did not spawn, so looks like she can spawn only once per map.

So I just would like to state that this is fairly easy with Beam Rifle after I realized there was super tiny beetles as well that you could barely see that needed to be killed. So be aware of that, then you just gotta kill them as they spawn around the area fairly quick like previously mentioned and she spawns and instantly starts running.

Took me about 12 mins of killing random small and big beetles. I didn't need to kill each one within a time limit. Mine just spawned totally randomly after I killed 1 one its own after a rest. She skuttles around fast so you need to be real quick to kill her; burrowed away after 10-12 seconds.