Mats will only get bigger and worse. The only time I have ever seen a mat "fall off by itself" is when it is SO bad that it tears away from the skin (something that you DO NOT want to happen). If you cannot comb it out, please take her to a groomer to have it done before it grows to a big matted mess. And NEVER and I repeat NEVER use a scissor on a cat. They are way to easy to cut.