I don't think staying will really have any effect on combat. We not in a shape to fight as sour said. We would be wiped heading to a city we made trips to already.
She KNOWS what where infected with, she said the sword was the only reason we where alive, she was hinting the whole fight something was wrong with us, and that we "where already dead" far she concerned where a walking corpse.... which we kinda are in some senses.
Besides, it could be BETTER if we leave, she just want her spider to hunt and be full, but she hates the sword, and us, which means she might be more inclined to attack if she knew we where there to get ride her biggest, and far she concerned, only problem, the sword. Again where a walking corpse, we are-selves didn't even make her feel threatened WITH the sword, at a far more healthy condition. If your right and she getting info from the spiders, and WALKING, cause by all accounts we shouldn't be, she going want finish the job soon she can.
Also i not say she was less scared. more hateing the weapon.