I wouldn't stress about it. You told her your terms, which are completely reasonable for that quantity. I would reach out one more time and say something like "I need payment by (this day) to start work, otherwise I won't be able to fill your request."
I know how frustrating it can be too. I tried to order some doll clothes for my daughter for Christmas. The last I heard from the shop I contacted was that the dresses were finished. After that, nothing. I checked a week later, shortly before Christmas, and there was still nothing listed for me in their shop.
Hope all works out