How to get my best friend back?

Hola and thanks for showing interest to solve my problem. Thanks a million!! I and My best friend or you can say my lil sis are friend since four years. And I have so many lil n big things for her as everyone do; even more than her parents. For example; her booksfees, scooter petrol, her cellphone, simcard, recharge on daily basis. I have done a lots uncounted things for her and even she knows this better. I have always expected better for her. Means in another words I have always trated her as my lil sis. But before 3 months I was hospitalised and I was almost dead in that situation. And I was expecting her to meet me, to be with me in that condition. And I was crying because I have done so much for her and she could not be wid me at the time when I need a moral support. As days were passing in hospital I was calling her and asking her to meet me but everytime she used to give me reasoning. At one time my other friend messaged her from my cellone for her this behaviour and criticised her in strong words and even I did the same. But still no change. She didnt came, called or messaged me once. So after that I met her to ask the reasoning and she told me her parents were angry on me. And they questioned on my character too and told me not to contact my best friend, otherwise they will take actions on me. This is my story. I just want to tell you and ask you all people that why is this happened wid me. By the oth of Jesus, I treat her as my sis, now what should I do to get her back? and why should I? why no she? if this isnt gonna happened then will she understand my valuation? will she come back? Please help!!