How much would it cost to renovate this house? And what would need to be done?

You did great. That was really interesting and descriptive. Bathrooms are anywhere from $2000-10000. Kitchens are $10000-20000. She can save a lot by doing things herself. But who knows maybe she will meet a hunky contractor. She needs new carpet and paint. Good wood floors can often be sanded down and refinished. If she has a good sturdy base it might not be too bad. The ceilings need plaster sounds like. I'd rip out the carpets. Maybe she has good wood flooring under there too.