It’s been 7 months since I stopped electrolysis on my eyebrows, and I only had 3 treatments. I still have a bad shape and holes in my brows. I’m afraid that it’s going to look like this for the rest of my life. Of the people who have had electrolysis done on your brows, how long did it take you to complete them, and did you have to treat the same hairs/areas multiple times? I ask because it’s hard to believe that in just one month a horrible electrologist could destroy my brows. Shouldn’t hairs in an area replace themselves at least once over the course of a year?
I can’t comment on brows specifically, but I have learned that if the electrologist is able to treat the telogen hairs in addition to the anagen hairs, then the active hairs are not always replaced by dormant hairs since many of the dormant follicles were killed at the same time as the active hairs.
On my arm, when I treated telogen hairs at full anagen depth, they were killed successfully and that patch had almost full baldness from just one treatment, permanently. A year later and it’s still essentially bald (except for sparse invisible baby fuzz that I didn’t treat). All the noticeable hairs were killed and (thus far) haven’t returned and it’s just under the 12 month mark if I recall correctly. Since eyebrows are far more delicate than arm hairs, I wouldn’t be surprised if electrolysis in this area was even more effective than on an arm.
That’s just my experience though, and I hope I’m wrong and that your brows will fill in soon. Many areas gain more hair as we age, but brows actually grow less hair with age on most females, so you probably won’t get NEW growth, so we just have to hope that your old growth comes back.
I really hope it does, I know how important eyebrows are to frame a face. 
Eyebrows are delicate. It is one area where plucking may actually cause permanent hair removal, as the scar tissue that builds up in the follicle may be enough to choke off the hair growing structures.
The eyebrows are so delicate that when the movie for Pink Floyd’s The Wall was filmed, and Bob Geldof was required to shave off his eyebrows in one scene, he would not do it without a Llyod’s of London insurance policy covering the possibility that they would not grow back.