WOW! That was a stark and rude reply to a new breeder!
Dear Maine Coon new breeder, The Maine Coon breed is a closed circle. It is really difficult getting help, unless you know someone OR you have a mentor. Breed standard is key to most breeders and they are very serious about it. It sounds to me like you need help, not critism. Please email me and I can steer you in a direction of help. The CFA has a wonderful mentor progrma.
Your contract with this person should address genetic issues, which should also allow you out of the contract if they arise. I have met some wonderful ethical Maine Coon breeders, and some real duds. Do not lose hope. When was your girls' last cycle and how old is she?