I don't like this film nearly as much as the previous sequel, but I think it would have all ended well here. Right after Angela kills the cop and the paramedic in the back, they should have quickly shown some sort of sign of loss of life say in her facial expressions or whatever that signified that she had just died. The idea would be that she eventually died from Marcie's wounds, but only after she lived just long enough to kill the cop and the paramedic before they finished her off themselves, and in that way, she got to "die on her own terms. Doing so in the back of the ambulance right after that last line Just taking care of business would have been a good way for her to go, I think.