The big problem you have here is that she is not in WA, this means that there will be an issue over personal jurisdiction on the case. The fact is that she has not actually come to WA to commit these acts, she is committing them in Idaho, which means there is going to even be an argument over which state's laws would apply. Typically, they would apply the laws of WA because this is where the effect of the harassment is occurring, but the fact is you would likely have to get an attorney in Idaho to sue her there because that is the only way you will get personal jurisdiction over her.
You would sue her for harassment and seek a restraining order against her prohibiting any further contact with you, your husband or your child either personally or through third parties. If you obtain this in Idaho, then you would have to return to WA and file the restraining order in WA to have it recognized and made enforceable by the WA courts as well.
At this point, this is not a simple matter, but one you will need to hire an attorney in Idaho to assist you with in order to take action to stop the harassment and abuse.
If your neighbor is involved in harassing you as well, that would have to be a separate suit you would file in WA for harassment and seeking a restraining order against them as well.
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