
I would continue with the calcium intake she is used to throughout the pregnancy, during labour I give calciboost and vet/nutrodrops as recommended by my mentor[some give vanilla icecream or TUMS as the calcium source], post whelping till pups are weaned goats milk, yoghurt,cottage cheese to prevent eclampsia, they all go down well here on top of the increased diet intake of what ever they will eat, mine can be fussy at this time so get spoilt rotten.
You can't help the mentor situation so don't worry about approaching the studs owner for help, I have had the studs owner and the dams breeder both supporting me with my first litter, the former knew the latter anyway, I was a trained midwife and my cat had 2 lots of kittens back in the early 80's which I was present for the delivery of each time.
Hope she continues to be in the best of health, start daily worming with Panacur 10% and increase food intake in smaller meals at 6 weeks and get ready for action stations 3 weeks later or there abouts.