So, if she’s sociable, and then people find out she didn’t go, they’re going to change their mind and consider her “not sociable?” I doubt it. OTOH, if someone’s not sociable in the first place, and then the busybodies find the non-camp history reinforces their preconceived notions, well that’s a different story.
Spoken as someone who himself went to sleepaway a couple of times, and am normal but not particularly sociable.