I had a lab for 13 years and in the summer his skin really dried out and he would exhibit this same behavior...sometimes he would start his leg going before you even touched him. :) She still might have some itchy skin related to summer allergies and it feels really good when you pet her anywhere..this is usually called a "tickle spot" :) It became like habit for him to kick his leg everytime he was touched :)
Try bathing her in an oatmeal bath...Arm and Hammer makes a WONDERFUL oatmeal bath and conditioning rinse :) YOu can also apply some neopsorin to the hairless red areas...that works well to clear them up :) It just sounds like she is super sensitive right now but I really wouldn't be too concerned about it :) You can also try giving her some plain benedryl 1mg per pound of body weight to see if that will help..if it does, it is definately itch related :)
Good luck with your girl and give her a pet from me :)
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