Working Indica in side reins?

Make them just loose enough that she can feel they're there, but not feel at all restricted by them. When she's just standing still, they should have a little slack in them. No, it shouldn't be any shorter at all. If anything, it should be looser. Your horse should step into the outside seat, leg, and rein, therefore your horse turns off of the outside rein, not the inside. The inside rein should only be used to provide inside leverage so that your horse goes more sideways, more into the outside aids, then it should be released.