Many rural jurisdictions don't have an animal control department. In these cases, you call the Sheriff's department and have somebody come over immediately to physically see the damage. Take pictures so you have a permanent record and write down EVERYTHING, every little detail, on a piece of paper, on a word document on your computer, in a journal, somewhere so you have it on record and will always remember the details, including descriptions of the dogs you saw. Ask the deputy who comes out what you can do if this happens again, see if you can shoot the dogs when they are on your property. Most rural jurisdictions will allow you to destroy roving dogs or will at least turn a blind eye to it because they are actually a public health and safety risk. They aren't just a threat to your livestock, but potentially to you as well. You don't know those dogs, and it is not your responsibility to get to know them.
The people who lived behind us used to have a bunch of pit bulls. The dogs were little goofballs, wonderful with people, but harassed the neighbor's dog and chickens, and the owners didn't do anything about it until the neighbors started shooting at their dogs. That is how dense people are, they won't do anything to solve the massive inconvenience, nuisance, and property damage their dogs cause until YOU become a threat to their precious little puppies. The neighbor has shown she cannot keep the dogs away from your chickens, so if she still has the dogs or gets new dogs in the future, this will happen again. I'm not one to just shoot random dogs I see on my property, but since her dogs have attacked your chickens twice now, she does not need a third warning to keep her dogs off your property. Next time you see them on your side of the property line, shoot them. Definitely be sure you can do this legally before you try it, there might be firearm discharge regulations where you're zoned (it does happen even in rural zoning sometimes).
Meanwhile perhaps you can beef up your chicken coop and run with some hardware cloth and skirting, more durable gate locks, etc, might need to raise the fence, I don't know how high yours is. Where I live you can shoot problem dogs in rural areas AND the neighbor would be required to replace the chickens her dogs helped kill.
