She doesn't seem to have evil motives, and she doesn't seem to enjoy suffering. Still, she can be ruthless and crush anyone standing in her way, even if doing so might be evil (Dex and Abraham). She also has quite a temper. Imagine if Magus had been living, would she then have killed him?
Pandora was (most likely) the one who marked Dex though. It seems unlikely that she would mark Dex and then some other Immortal would manipulate him into "bringing an apocalypse".
Isn't that kind of evil? I'd argue that it is, although if a character does a large amount of good (such as V from The Order of the Stick) then it may still balance out as neutral. Pandora doesn't seem to do all that much good though, from what I've seen, aside from marking Tom (I'm not sure if marking Tedd counts, even if she considers it "being nice").