hi
We had huge knots on our poppet when we left BIL looking after it for 2 weeks.
Instead of trying to cut the knot away from the base of it, have you tried cutting across the knot , this seems to work and then you would just use your fingers to fluff the rest out. It may take a few times of cutting accross the knot but you should manage it and stops any chance of cutting into the skin.
I can understand she doesnt want you to do it as ours used to run away from us and this was after trying to get the first knot out