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I'm still a bit confused about the knotting. Were they literally tied into a knot, like you'd tie a rope in a knot? Or were the roots tightened with a hook or other tool? Or were the roots flipped?
If they were tied in a knot, I'd say start over. Knots will stop locking on a large scalp. If your hair is shorter, you may see a little matting below the knot, but not much. You'll end up having pretty straight hair below the knot. It will mat above the knot, but not well, and nothealthily.
If they were root flipped, leave them. If it was done 4 months ago, and not since, you probably wont be able to see the area where it was done, and undo it. If you can't see it, then undoing it will cause more harm. Once won't kill your locks.
If crocheting or any other tool was used, again once won't kill them, but don't do it anymore.
I'm glad your friend isn't helping out anymore. Lock peppa is a scam. Everything from KB and DHHQ is a scam. Almost everything they sell is damaging to dreadlocks.
Get a non residue Shampoo. Dr. Bronners is good, but doesn't work in hard water. Or the Baking soda wash. But that, again, doesn't work well in hard water. Or get a soap from dreadlockshampoo.com. Their stuff rocks and works in any type of water.
Wash 1-3 times a week, and let them air dry as much as possible