Hugs and prayers from here, too, Tami. What everyone else has said about being safe.
I went poking around the County website. Looks like all DV services are consigned to their Dept. of Social/Human Services, with no direct tie-in to the legal system or law enforcement. From what you have said, I'm guessing your mum finally just got the hell out of Dodge last summer, and did not bring domestic assault charges against the guy in Snohomish Co., so neither the Prosecuting Attorney's office or the District Court have any prior involvement. I also notice that the Victim's Assistance unit with the Prosecuting Attorney's office seems to be dedicated only to victims of serious felonies, and neither the Prosecuting Attorney's office nor the Sheriff's Dept. appears to have a family violence coordinator or liason. The County is clearly well behind the curve regarding DV services. Don't know if that is because of lack of resources or prevailing attitudes.
As you have already found, it does mean there are few, if any, pressure or leverage points within their system that can be used to coerce help from the Sheriff's dept. It still might be worth calling the PA's office or the District Court to try to get those papers served so the protection order can be maintained, but don't hold your breath.
If he is still stalking your Mom via e-mail and telephone, she needs to lose both the phone number and the e-mail account.