@zarif I have a working line ACD/border hybrid I rescued during the height of covid as well. I say this with tremendous gentleness, understanding & compassion - these aversive techniques will not work with a high drive herding breed & I'd strongly suggest contacting a herding dog rescue in your area. It sounds like you love your dog immensely, but your home and lifestyle are just not a good fit. Cattle Dogs are insanely high drive and have a lot of the same issues protection breeds have, because they have a genetic predisposition to use their teeth & have virtually no bite inhibition. They need jobs to do & tons of things to occupy their brains, and they just aren't a good fit for a lot of people's homes. Rehoming through a rescue that understands the needs of dogs like heelers could save her life. They are unique dogs, very prone to reactivity in home settings and need an enormous amount of stimulation, exercise, redirection for their native bite impulse, and general training.