Is it legal for a friend to charge money to her other friends for making mistakes?

She used to use physical violence, or threat of violence, if we didn't listen to her. Now she charges money if we do things that "take up her time". She had asked for certain behaviors in the past and if we forget to do those behaviors she charges us - $100 a day - and up until now, I have believed that it would help me change. Now I feel awful, because I forgot to do something, she charged me, and it puts my family and my finances at risk to keep paying her (and making the same mistakes). I want this to end! When I have decided to stop in the past, she and all the friends call and call and write emails and say I am wrong, inconsiderate, and that I will be modeling poor behavior to my daughter. I always want to improve myself and have trusted her perceptions in the past, but also done things out of fear. Now I feel its all just totally wrong. What do I do? Can she come after me for this money she says I owe her?. If I made a verbal agreement to this arrangement in the past, can I change it somehow? Every time I have stated I wouldn't pay her anymore she manages to charge more and says I am stubborn and resistant. How do I address this so it can finally change?