it sounds like she needs a rake comb..

Product Information:
MiracleCorp combines the secure feel of a soft, non-slip grip with a functional grooming tool for dogs with thick fur or dense double coats (top and under coats). To relieve mats, tagles and loose hair from dense undercoats, the rake is the best option. The teeth of the rake glide throught the undercoat without disturbing the outer coat. Large head quickly untangle coats.
http://www.petsmart.com/global/produ...N=2026050&Ne=2