Can one co-owner of real property force another co-owner to sell?

Question Details:

I am co-owner of a house with my sister (we inherited it after our mother's passing). I have had to move into the house due to unemployment and no income. Also, I have a permanent handicap that is making it hard to find a job. We had verbally agreed to 5 or 6 years before I had to buy her half, then she changed it to 1 year, and now she wants to force me to sell the house so hat she can get her half. This will leave me with no place to go. Can she force me to sell leaving me with little money from the sale and no place to go, or do I have rights since I live here and there was a verbal agreement? Important Notice