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I'd say you have done the right thing by isolating her until she heels. You may wish to go down the route of re-introducing her gradually, one chicken at a time to try ease her transition back into the flock - lots of threads on introducing new chickens to a flock, so check them out.
If you know which hen is the ringleader for the pecking, you could consider isolating her for a while, when you re-introduce the chicken.
See how that goes. If she has been a flock member for a long while and you have not seen this behaviour before, it may be that she is sick and the rest of the flock sense it.
So yesterday we went out to put out the birds and found one of our chicken was a victim of being pecked by a few other birds! It was a bloody mess! We cleaned it up with Vetericyn spray and put her in a clean coop all to her self. I can't get the picture to upload!! She is bald on the top now!. She is a polish. There is now a green ring around her head. If you give me your email I can send a picture. WHAT CAN I DO????
Spray her head with BlueKote or apply some Nustock Cream to the scalp after a couple of days of healing. Instead of removing herfrom the flock, separate her by a temporary fence, gate, or a crate. She needs to remain a part of the group, or she may be pecked worse. This pulling out of head feathers is a common problem with Polish chickens. I raised 2 of them and we went through this same thing several times. I had success with BluKote, but it does stain the feathers for a couple of weeks, and has to be reapplied every 2-3 days. Nustcok contains pine oil and sulfur which hides, but also tastes bad.