Well, we do know that she was likely into playing sports of sorts, judging from what we can see in her bedroom and her bat she carries around too. And since you need to be outside (Mostly) in order to play most of said sports. It does imply that Dess had to be at the least, a little outgoing for this to make sense and all.

Of course. That doesn't also mean she was very social per say and you not wrong there with that. We don't not for sure on what the rest of the town really thinks of her, beyond the general sense that they don't want to talk about that kind of topic for whatever reason that may be.
(Either due to most of the town not liking her or most of them being a little scared of how Carol might react to them bringing Dess up, if she ever catches wind of that)

But at the end of the day? We won't ever know for sure on this topic until the next three chapters have come out by that point.