Personally,I think that this person seems to know her way around the laws/rules/systems.
Unless(at the present time) she is affecting you personally/jobwise/financially,I would give her a wide berth.
She sounds like she could wangle things and drop you in the sh!t bigtime,so if possible just try and keep away from her and don't atagonise her.
If you didn't work together my advice might be different.
If a venomous snake is curled up in the corner of you office and ignoring you,would you go close to it and poke it with a stick?