Dd has been down with a virus for a couple of days, nothing serious just the normal bugs 4 yrs olds pick up. Problem is her her tight curly mixed race hair. She's not let me touch her head for these last few days & now it's tightly matted at the back of her head, even though its been tied back when she sleeps. Feel really bad that I've let it get matted, any ideas on how I can get these knots out?