There is a tool for removing mats. It works okay. I cut Zoee's out. When they are near the ears I cut them out only if other hair will cover it up and then you can never tell.
Try this, if Digi will let you, take scissors and try to comb through it with the blade of the scissors. Do you know what I mean? Then when it's small enough just cut out the rest so you don't leave a huge short spot on her head. Sometimes I'll just sit and work it apart with my fingers too.