If other dogs at the dog park sense her fear or hear her yelping,etc that can attract trouble. When my pup was attacked, the more he cried the more upset the other dog became. Obedience classes and being around stable dogs is what she needs.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD