I am a contractor and my customer did not want to sign a contract so I have been working with her by invoices. I have collected 60% so far as down payment. I asked for progress payment when the project was almost completed but she refused and said she won’t pay until job was completed. I have warned her if she doesn’t pay, I will file a lien. I have been sending her invoices every 30 days since and I am approaching 100 days. Job was completed on 12/6/20. What do you recommend?