Where do I sue someone who owes me over $50,000 acknowledges the debt, promises to pay every time but continually forfeits

I entered into a contract to invest $80,000 worth of personal money with a RN who owns a private school in the Philippines with profit to be paid in 3-month-installments and the final sum (including the original investment amount) to be paid at the end of the one-year-contract. However, she (RN) has deliberately and consistently pay the profits and would not meet every time we agree to have a meeting. She now avoids my calls and sends text messages about once or twice every week that the money will be paid. I I am very much interested in suing this person and possibly having her pay for the legal costs. About how much will it cost to get a lawyer and how much time am I looking at to get the money refunded.