Plague is the new Legion
Don't get me wrong, she's nowhere near as busted as moon-walking legions were or prayer bead Spirits are now. She's just not fun.
Just by being in the game and being herself, she cancels out Every heal perk and most stealth perks in the game. Most of which are commonly taken in to trials. Which is frustrating on its own. But as a solo player, she's an entire other level of annoying.
There's no communication between teammates. I know there's still a bunch of back and forth in strategy on cleanse vs don't cleanse but there's no consensus when it comes to playing solo without talking together. And alls what it takes is one person to go against it and it throws the whole strategy off. At least with SWF you can choose your strategy on how you handle things and if things don't work out it doesn't work out.
If I were to fix it...Tbh It should work a lot like Freddys generator power. It should charge up incredibly slowly (or even not at all) at base but have a faster charge for every player infected. Infection now has a timer that runs out. If you weren't fully sick you will return healthy but if you were you will still be injured.
Cleansing stops the plague from charging off you but puts half the time you had left into charge as you're putting your sickness into the fountain. That means it's in your best interest to cleanse as quick as possible to get your health back as well as stopping the killer from getting double charge off of you over time. And it's in the plagues best interest to keep everyone as sick as possible. The fountain remains pure even after use.
Pallets, gens, and infected players, will still be contaminated but it will only raise your sickness while you are interacting with the object. Saves and pallets will give you a little more to make them fair as you only touch them for a moment and it would be kinda bad for the killer to give you Zero penalty for using it.
When the bar is full, all fountains turn into corrupt ones during the duration of corrupt purge and she automatically gains the corrupt purge without going to a fountain, and the cycle repeats.
Maybe it can be put on a button trigger to make it more skillful but it would have to have a small charge animation so you don't instantly down the survivor with a range attack and give them some sort of chance.