hope she takes for you, i have just been through the ups and downs with this recently and decided not to proceed as my mare had a pool of fluid in her uterus after mating and did not take and then needed lots of veterinary care
she is older and its fairly common apparently, but for me and her i dont think its meant to be, she has had 6 foals previously, you never know i may decide to take to plunge next year, we shall see, have to weigh it all up, i will probably just buy a foal next year, good luck and save the worry