If a husband post talaq nama to his wife after sending he want to live with her and he said to his friend that he receive it or he take it back own self` or talaq nama is lost while a few members of his family know about it that he done this work so kindly tell me that in this case talaq can happened?

If a girl want to marriage about her own choice and her parents make the decision of her marriage against her and they do not ask yes or no from girl .[as the order of islam that I accept it]. They simply take sign from her on nikah nama and the girl want to marrige with any other boy.so what method she has to adopt for this purpose? And in this case nikah can happened?