A question about invisible woman

Is the only way IW regenerate health through masochism node?
Sometimes I notice her health go up even when she has no debuff on her.
I use Angela, and she doesn't put any debuff on enemies that I know off.
Sometimes I notice her health go up even when she has no debuff on her.
I use Angela, and she doesn't put any debuff on enemies that I know off.
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I have had a situation with her regenerating from 45% health all the way up to 95%. I am not sure how that happened because her Masochism only allows a 5% regeneration. It might be a bug or something but I only had a problem with it on one occasion.