I wish I had more to work with than the picture, stats, and the game starting with us captured by some unknown group. Not much world building here. The product sheet just says madness is coming.
I also feel she should have Deception or Survival. Otherwise she's not much of a scout/infiltrator. Since she doesn't have one of those skill, I wrote her background as counter-intelligence since her wisdom (and perception) are too low for going off into unknown territory by herself. She would get lost too much.
Here goes:
Thia
Trait: I am guarded and slow to become friends.
Trait: I act like I don't care about anything. But important things matter.
Ideal: Freedom is important. Curbed freedom must be fought against.
Bond: Anyone who treats me as weak because I'm a woman or an elf, will find out I'm not so weak.
Flaw: I don't think there's anyone in this world who will love me and thus I push people away
Personality: Thia was once an outgoing, fun-loving person. When she lets her guard down, that person peeks out sometimes. But otherwise she seems as dour as a dwarf, all business.
Background: Thia loves to sing old romantic tales and tell stories of ancient heroes. Doing so reminds her of Feliza Manig, her mentor and teacher for many years. She does not talk about her parents, her father always complained about not having a son. This is also why she doesn't tell people her family name when she introduces herself.
Then the war came and her music teacher was killed in a raid on his village. She immediately put down her flute and enlisted as a scout. She worked mostly in counter-intelligence, spreading rumors and discord among the enemies, investigating rumors, and routing out enemy spies.
Posted before I saw this edit.
So she probably was party of a group, one character which could have been a guide to help Thia not become lost. You may also notice that these aren't typical characters I wanted to explore different archetypes as well as some spells and feats (to come). The counter-intelligence is a great add in, I like thinking of her outwitting her opponents more than using brute force. She feels like the "Hannibal" of her A-Team when they went on a mission.
So she was still a soldier when she was captured? Did she fight some drow that were in an orc camp and wasn't ready? Or was she ambushed? Betrayed by a party member (thus why she isn't trusting now)? A low wisdom can be played as absent -minded or tends to focus on one/two things and does not multi-tasking well. Is Thia all about the mission and everything else normally comes in second or never gets a second thought.