Some changes to Plague and a bug
I feel that making her TR being 24m would be a good change to her, not making her OP and balancing in a good way. She is not good in loops, nor in implementing pressure on survivors by travelling through map in a fast way, so I think being able to move a little closer to survivors while having lower TR would be a good thing.
While removing instaheal from fountains would not be a good change, she could use some changes to her power too - and by a change I mean that infected survivors should not see redstain, and their ability to hear TR should get weaker overtime. It would encourage them to actually use fountains.
Oh, and last thing - when she uses a fountain, and gains Corrupted Purge, it deletes when she gets pallet stunned. Is it intended?