(Jyn) She was Fighting the Empire with Saw until he dumped her… She then went off under a different identity and felt betrayed like what she was a part of had ousted her or made her feel unwanted or not good enough.

So she gave up caring as She felt she Lost not only her “Real” mum & dad but also her Surrogate dad dumped her. And she did not know how to find SAW either.

But it really was all done and explained a bit too quick. It was not given enough weight.

But I like shady Cassian too and Jyn.

I think in the first Assembly she was on Jedha presumeably looking for Saw Gerrera or always had been part of his group.