I was thinking that a women would be part of heir husbands "sippe" when they marry, but I may be wrong. But independently of that, the text dosen't mention that this is a fight between a wife and a husband.

And further If two men are fifth degree or closer in relation they are forbidden by right to fight each other (in a trial by Combat). 7 men from the fathers or mothers side have to swear for this.

I can translate it for you, If you want to.

Hans Talhoffers fencing manual states, that is forbidden that the combatants are closer than a relation in the fifth degree (Item wenn zween mann gesinnt sind biß uff die fünffte sipp oder näher die mügent durch recht nit mit ein ander kempfen und des müssn siben man schwern die die vatter und muotter halb mäge sind - Talhoffer 1459, Page 9 recto) Therefore a fight between wife and husband is not shown in this document and probably illegal.