Like their male vercion, she freak has problems when you scale your upper body  (Figure 1), try following the solution that I applies and worked in male Freak:

1. open up the freak,
2. bring up the joint editor,
3. select the chest,
4. select the lCollar scale zone,
5. press the button to fix mismatched scale zones, the problem corrects.
6. select the rCollar actor
7. select the chest smooth zone in the joint editor
8. press the button to fix mismatched scale zone.

but only solves the problem in her right arm, ¿any idea how to fix it in both arms?

If I copy the symmetry from right to left that will not bring me problems in the future?

Thanks in advance