She could wait for her body to do it on its own. This is hard because it can take a month or more for the body to realize it isn't pregnant anymore. In this case, she may want to monitor clotting factors and prepare herself emotionally. It can be done. Our bodies know what to do. She should find an experienced caregiver for this.
I am not sure how the herbal or homeopathic remedies would work in this case but she could try the usual- Cottonroot Bark, Blue Cohosh, Homeopathic Caullophyllum
She could also try Wild Carrot seed and flower tincture. Take 1-2 dropperfuls in a little water every 8 hours for 3 days. Then stop. This is what you would do for birth control after unprotected sex. It may work for her in this instance.