Softball pitching tips for beginning youth?

Please help me. My 10 year old daughter is just beginning softball and wants to pitch. She and I have been practicing and practicing but we are really getting no where. Her speed with the windmill is ok but her accuracy is terrible. I tried taking plywood and puting a ductape square on it for a target but she just seems to keep to low. How do I help her get out of this low ball slump? Please help her......... and me? Thanks much in advance.