skin picking: 5 yr old child

hello, i stumbled upon this site as i was searching for info regarding skin picking. i have a 5 yr old daughter (soon will be 6) who i am concerned about and i hope to get some input from those that have stuggled with this since young. i noticed that my daughter started to peel her nails (i used to bite my nails, like most kids do and even as an adult but never to an extreme)....about a year ago. around that same time, i noticed that she picks at her finger tip skin. i have asked why she does it and she is not able to express as to why until yesterday. yesterday, was the 1st time (that i noticed) that blood came out from her picking at her skin. i have noticed that she is extremely sensative to junk food. junk food is filled with dyes, fillers, toxins and who knows what else. and she seems to react to those. she has broken out with skin rashes in the past. once she had cotton candy (while at the circus) and she did not eat a lot of it, at started to act "drunk." i have limited her junk food intake and feel that i need to ahve her on a healthy diet 100%. other than diet, what do you recommed i do to help her stop? i have her wear cotton gloves (even to kinder) to help her not pick so much...she takes them off while snack time, but i can see she has picked at her finger tips. i have observed her and noticed that she does it while she plays with other kids or during ballet too. the night that she drew blood for the 1st time, my heart broke for her. i started to worry SO much that even i started to feel as if i was going to have a pnic attack. i want to help her. i don't want for this to get out of control. i fear infections. i fear that it will get worse. your thoughts are greatly appreciated! thank you so much! =) kim