Wow this is a tough one because my two immediate thoughts go like this:
thanks for saving me money
I wanted 12 yards and you cut it without knowing how I wanted to use the material
But you were still in a tough spot with her because you did try to contact her and she wasn't responding but would have likely sent you an angry email for taking forever to send her the material had you just waited for a response.
You are a business and can't leave orders open eternally.
Hmmph......stumped :)