It is called submissive urination. You need to ignore her instead of getting upset with her about it. Also a standing posture is dominant and brings out her submissiveness. If you will not reach for her from a standing position it will help a lot. Just sit down on the floor and call her into your lap. Or sit on the couch and let her come up to you.
It is not something that she has control of. It is just in her nature to be very submissive. The more you speak sharply to her about it just reinforces her behavior. Instead work on giving her more confidence and building up your relationship with her.
Here are some websites that explain this and how best to deal with it.
submissive urination - Google Search=
Some dogs are only affected when intimidated by your dominant behavior or posture, others only when they are excited and some in both circumstances. It sounds like yours is only when intimidated. If you follow the suggestions in the websites this kind can be easily avoided.
If you are not willing to work with her you might want to purchase panties or diapers for her.