We never established what the symbol looks like so: 
[img]http://rs634.pbsrc.com/albums/uu69/ivankhim/tribal-tattoo-picture-0287.jpg~c200[/img]

Also, I had the idea that at first they think that Ty was kidnapped (if Otiz convinces her to run and not waste her life) but then later they find out that she ran off and then, you know, adds heavy to the 'traitor' aspect.