Hopefully you don't come across anyone fitting those criteria. If you do, generally a piece of wood through the heart does the trick. Holy water can slow them down if you need a quick exit. (If she came through the portal from her world there was no telling if anyone, or anything, did too. Better to give safe pointers just in case.)

How long have you been here? (It seems a reasonable thing to ask. She's hoping it's not years. Really hoping.) Assuming you came through a portal, too.

(A firm nod at the question. Although problem was an understatement if ever. It's all good. She's a little envious. A world without vampires seems like it would be nice. Is it nice?

Oh, the sparkle ones. Buffy knows all about those. On paper only. The ones she deals with do not sparkle. Thankfully. They just tend to have no souls, except for two.)

Kinda. I mean yeah they're a problem and it's sorta my job to make sure they don't make bigger problems.