I know i was not cleare, and in reality is a small thing.
On the scene where the old girlfriend (sorry i forgot all characters names) is pointing the crossbow, and dragon is all "i trusth you, dont worry" it looks like like that girl is going to shoot, she is even pulling the trigger half way and the camera makes a huge zoom to show us she is going to fire. Justifying Raya's action of trying to stop her.
If instead looked like MAYBE she wasn't going to shoot, and was more of Rayas fault.
For not trusting her and scaring her made her shoot, or even that was her fault the gun trigger.
That would justify the old girlfriend saying it was your fault for not trusting me.
But like they showed the crossbow was almost fired and no sign of regrets of "maybe I wont shoot after all", Instead of being Rayas fault for not trusting, it look like Raya reacted to late to stop her.
Or at least that is how I saw it.