Ike87,
You will need evidence of the traditional marriage. Pictures during the ceremony will help a lot. Traditional marriages are registerable and recognized. That's what you should have done. That was how I married. We then went to the court to do the registration.
Are you referring to "knocking" when you say traditional marriage? There's no legality with "knocking" and cannot be registered, but you should have picture to prove. This, together with the court registration you plan having will get you through. To explain the terminology to other readers, "knocking" is akin to engagement in the western world, but a few family members may be present as witnesses.
Also, prior correspondences, pictures together, (with her) and with her family, in functions attended, etc. will also help. Anything that proves that you have had a long standing relationship before she won the lottery.