Champ Story

So about Fiora's lore. So let us say if she did marry that crownguard dude from the crownguard house, what would the perks for Fiora be for being married into the crownguards? Would she have to change her last name to Crownguard? And overall, how would that affect Garen and Lux, would they have to get along and treat her as family? Also as a Crownguard that means Fiora wouldn't be allowed to duel anymore because the guy she married probably would be calling the shots right?

Like what was the main reason why turned the marriage down? Wouldn't her marrying into the crownguards actually help recover and rebuild her House Laurent's reputation?