It sounds like she may be going into labor. I had deliveries that went perfect on day 56 , so usually i consider that anything may happen after day 56 . Any chance you may have missed the correct date and she may have tied a couple days earlier than what you recorded?
I would take it to the vets anyways just to run a blood work and make sure all is perfect. Other than that if she is ready to labor i do not think i can give you any advice. There are a couple things that can cause early labor , but i do not want to jump into it to get you even more worried.
Blessings.
XOXO
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