The Plague is fun but...
The game is boring when the killer is camping and tunneling to get a quad survivor win.
It's fair and still highly guaranteed a 4 kills (even survivors that are gen rushing, use combo BBQ - Tinkerer - Corrupt Intervention and vomit-hit then hook and do the same thing again, it's really easy for her to down people) if you play cool and don't tunnel.
As a survivor playing against her, you can combo Head On - Poised - Spine Chill if you want to do gens and be sneaky; Vigil - Sprint Burst if you are a runner and don't want to get puked on at early stage. Also Self-care is not recommended since the fountain can heal you right away.
Overall she need to be nerfed a little bit, like 2s -50% movement speed (it's about 1s at the moment) while chasing when you directly vomit a survivor that goes into broken status.