I'm so sorry you are experiencing such stress while you are pregnant. Take care of yourself and the baby. Can you call a collection agency and ask them some question about persuing this woman? I have a friend who did that years ago.

I had a family leave without giving notice or paying for their last week of care in my first year in business. It's a hard lesson to learn, but it certainly makes you more strict with your policies, contract, payments and future clients.