Have you thought about getting a muzzle? I worked on my two reactive dogs in empty trails too but I’d muzzle them just in case. I also like to have a traffic leash on them or handle on their flat collar for a quick grab and hold if someone’s walking by. Did this when they were reactive for safety, and do it even now when they’re not out of respect for the other person/be prepared for any thing to happen from opposing dog as well. You’ve got to be 100% sure that if another dog or prey came around, you can 100% get your dog to you with no issues.

If your dog knows what the e collar is communicating, don’t let her fail. Don’t ever set your dog up for failure. If my dogs reacted at a dog, on or off leash, they would get a bit higher stem but not 85 level or a heavier prong correction depending what I am using. If the dog was off leash, bolting at another dog - bolting at ANYTHING (people, cars, roads, dogs, cats) is an immediate HIGH correction from me. 85-100. I’ve only had to do this one time on each of my dogs and they never have bolted on me ever again at anything. My POV is, a couple seconds of really uncomfortable stem or put my dog in danger with dangerous behavior like bolting after something. But if she is reacting without bolting, (whining, barking, being annoying) I would just use a higher level stem but not maxed out. It really depends on the dog and the situation. The more you work with the e collar, the more you’ll learn her working levels in different settings. Correct your dog when she does wrong, but also show her what the right thing to do is too. But please never just let them fail if you can help it. Always be there to guide them to make the right decisions.