I live about 8 miles from Kent. There is one dog park in Kent but, and this is really weird, there is no fence around it. It wouldn't take anything for Dell to sprint out of there and I wouldn't be able to catch him. If her dog is well trained, she shouldn't have any problems there
In Federal Way, there is a decent dog park, IF they've cleaned up the pond (and they were supposed to in September). The water there was making dogs sick. Fortunately we stopped going before Dell got sick.
The park we go to is about a twenty minute drive for us but it's 10 acres of fully fenced, well maintained dog park. Misbehavior is not tolerated and aggressive dogs are strictly prohibited. The regulars there make sure the rules are enforced. There's a section for smaller dogs as well. Well worth the drive.
If you want more information or addresses for the parks, PM me and I'll get them for you.
Amy