dog behavior at dog parks?

okay, so. i've been taking my male and female mixes to the dog parks in my city a few times, and all of the dogs are always running around, playing with each other and exploring. while my female is at my hip the entire time. she's usually a velcro dog, but she's so cautious around unfamiliar people and dogs for some reason. she doesn't let any of the dog owners there pet her, she sniffs around a little bit, but cowers and runs from the other dogs, she seems just too unsure. and it's weird because, she always bosses my male around at home, and they play together all the time. anyway, my male on the other hand, loves everyone and everything. he has no problem with it. and i'm surprised she doesn't follow his lead like she usually does. i've socialized them exceptionally well, but she hasn't come around to any of it. is there a solution to her skittishness? i'm not exactly sure what to do. i've read online that its good to keep taking her, but i also saw somewhere that i shouldn't bring her anymore. help? opinions? thanks!