When to buy equipment for fighters added through the settlement?

Hey there! First question here. So we started a campaign in my club and despite the fact that we're kinda struggling with the rules, we're having a blast! After my first game, I gained a juve through my settlement boon (rolled a 6). This juve comes naked. I have nothing in the stash to equip her. Question: can I immediately buy a weapon for her, or should I wait the next round of visit to the trading post, which will happen after the next game?