Firstly, your friend should think about her mother. She has also got right to live her life. This she will understand after some time but for the sake of her mother she should try to understand her step father. She might not like his some of the habits but every person has something good in him. So she should try to talk to her step father then only she will come to know him as a person. Most importantly, she should understand that no body can take place of her father but atleast she should give him a chance to be father-like. If she will have strained relations with him then it will hurt her mother as well. May be your friend’s step father become a good friend for her but unless and until she gives him a chance, nothing positive will happen. Ask her to be open and good to her step father, just for the sake of her mother and eventually everything will be normal.