I wish the best of luck to you. When I have bought off of mattytoycollector's website before during their regular monthly toy release it's always a mad dash to grab what you want. They have horrible servers that crash since they cannot handle a normal sale. I have gotten the "white screen of death" too often to count. I am not impressed with how they do things over there and try to avoid buying from them as much as possible.
Do you already have an account with them? If not, I would recommend putting something in your cart as if to check out, fill out and save all your billing/shipping/user information, and then cancel that transaction. I don't think there is a "normal" way to set up an account without buying something from their web site. It's a really backwards system they have over there. It should hopefully save you time if you get her in your cart and start trying to check out.
As for advice, it will be very busy, so try to log in early that day. They will not save items that are in your cart as you are checking out. In fact, I have been "stuck" trying to check out a figure when it becomes sold out and my item is mysteriously gone from my cart and I miss out. Not trying to worry you, but, be prepared for a mess.
I also unfortunately missed out on Ditzy doo too, which makes me sad and upset with Hasbro.
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