Can I file a lien mechanics lien?

My friend was in the process of acquiring a loan on her home to make improvements on it. I told her I could start a remodel a few weeks before as long as she took care of my essential needs and that I didn't mind working poor for a little while. I asked to be paid $150 a week about a month into the job. I asked her to sell her broken down second car (she has a late model, reliable VW as her daily driver). She is unwilling to do either. As of the 9th of December I have received a little under $4000. The majority of that has been used to buy job related items. I have completed 70% + of the job. She has helped me get food, a few items of clothing at a thrift store, tobacco and alcohol. That's part of the almost 4k I have received. I have no insurance, registration, inspection along with many other things. I have a cyst in my right armpit and when I told her I might need $200 to have it removed so I could move my arm without pain while working she balked. I have had to ask her for almost everything I buy and she has to be there to pay. I have never really known what is available as far as cash or credit. She told me she would get me $150 a week from a relative because I was complaining about not being paid. That has not happened. The total for the job was a "friend" price of 21600 to remodel 960 sq ft. In my view and that of a mutual friend, she seems to have very little interest in paying me. Here is the embarrassing part; I never had her sign a contract. However I have numerous texts, a friend who has talked with her at length about the details of our arrangement and work that is completed. Am I screwed?