I would take all toys away and never play with toys with the two of them together. I personally would have beaten the crap out of Heidi for not listening to me and continuing to bite, but as of now, there is nothing you can or should do to her. Be very careful reintroducing the two of them. It's very possible they will be just fine as long as you keep her stimulation level down - as in no toy playing. If she still shows aggression to the lab, you are probably going to have to keep them separated for a long time.
So long as the wounds aren't deep and you keep an eye on them for infection, I would keep up as you are doing with them.
So long as the wounds aren't deep and you keep an eye on them for infection, I would keep up as you are doing with them.