For the call that Carolina received, I think is a cryptic phone call that set her on edge, and now she's on a mission to prepare for something.

As for the ammo and spray paint that she purchase hint at a potentially dangerous or covert operation.

As for where you guys are, at this point I will say you are in a small town in Texas is likely somewhere along the Interstate 10 or Interstate 20 corridors, given the mention of being in the middle of Texas. So I will say you are in Ozona texas.

https://maps.app.goo.gl/S2Q8BgP8PTWFAcJFA?g_st=ac

As for what's going on, I think Carolina is preparing for something dangerous that is about to happen. And she is ready for the challenge