Judging from most of her writing online (which is all pretty assertive) I think it's far more likely she said "if you don't fix this, I can't continue working here".
And that's both a negotiating position and a resignation.
Something can't be both. A resignation is an unconditional desire to leave. "If you don't fix this, I can't continue working here", though, is a desire to stay.
And that's both a negotiating position and a resignation.