You can’t delete people of your life, if she someday do an effort be polite and talk to her the same way. Don’t worry, some people can change their ideas one day to another, she may have a problem as well. Be patient, if you both didn’t fight, it may be only something in her interior, but if there is an issue talk to her, if she doesn’t want to talk you shouldn’t insist. You may think that she has a problem, so would be a good idea to go to her house. She maybe needs time or wants to be alone as well,in this case give her space. My father experienced the same with a friend he helped when he got very sick, then he doesn’t know why his friend didn’t give thanks, it doesn’t mean that he is deleted of his life. People in life go and come, you can continue make more friends if she doesn’t talk to you, people won’t react as we expect. If she is showing interest in talk to you again someday, be good to her, if she is rude, take distance but never say a insult and say what you think politely.