She got married without writing the marriage contract – should she repeat the marriage?
Question

                I have been married for a year and a half and when i got married it was to a muslim man and i became muslim after a year and a month of being married we did the marriage islamically correct ie: he asked my fathers permission and had two witnesses and he asked me what i wanted for dawry but we did not make a marriage contract do we need to make one and is the marriage valid?and also i do not have a Wali do i need one?.
Praise be to Allah.Firstly: 
May Allaah bless you; we 
    congratulate you for the blessing of Islam, for it is the greatest of 
    blessings. We also congratulate you for your marriage, and we ask Allaah to 
    continue to bless it, and to bless you with a righteous husband and 
    righteous offspring. 
Secondly: 
If the marriage was done 
    with the agreement of your father and in the presence of two witnesses, then 
    it is a valid marriage, and it does not matter that the marriage contract 
    was not written down or that the mahr (dowry) was not recorded. But the 
    marriage contract should be written down because that helps to protect 
    people’s rights. As your marriage was done before you became Muslim, then 
    your wali (guardian) was your father who was of the same religion as you, so 
    if you want to write it down and document what is in the marriage contract, 
    there is nothing wrong with that. 
But now your father is not 
    qualified to act as your guardian, because of the difference in religion. 
    See the answer to question no. 48992. 
But you do not need a wali 
    now, because the previous marriage contract is valid, as stated above. 
And Allaah knows best.