Hmm. Several things, in no particular order.<br/><br/>I'd rather people not swap characters mid-adventure... at all, really, but particularly not unless they're genuinely down and out.<br/><br/>The difference between 1HP and full HP at 1st level is not large. You go down in 1 hit instead of 2, if you get hit.<br/><br/>She could grab her armor (maybe somebody brought it with them?) and be a perfectly viable frontliner, mostly via praying not to get hit it's true, and it isn't the end of the world if you get downed again.<br/><br/>The way this adventure is set up, you don't actually need to get into combat again if you play your cards right (there are many different paths to move forward, of which hitting up the dungeon is only one) and are a bit flexible about when you declare victory.<br/><br/>A short rest (represented by her taking a bit to recuperate+interrogate prisoners) lets you spend a hit die to get back 1d10 HP.