My Bella also had an eclamptic attack with her first litter. NOT her normal vet had recommended too small of a dose of her calcium daily meds. (Said to give her 1/4 of a pill 2 times a day, when it should have been 1/2 a pill two times per day.) Bella had such an issue with diet after her first litter and would only eat meat, chicken to be exact. WOULD NOT TOUCH DOG FOOD. So my thinking was ok get her to eat what she will, and if chicken was it, chicken was it. To my horror at about 3 weeks she started shaking, couldn't walk properly, and was very lethargic. I knew instantly what it was, and administered calsorb.....she got a bit better, but kept panting and shaking.....off to the emergency vet we went. (OF course this happened at 11pm on a saturday night!!!!) Thankfully with a bit more calsorb in the car on the way, she made a vast improvement. ER vets gave her IV calcium and kept my poor baby over night. (750.00 bill later!!!)
We bottle, drop fed the pups, OM what a NIGHTMARE, they wanted nothing to do with the bottle or formula. ER Vet recommended letting one pup nurse at a time, and to bottle feed the others, and recommended the same dose of calcium to supplement.
Monday morning, everyone was better, off we went to Bellas normal vet. I told him what happened, they drew blood to get calcium levels, he instantly told me what the problem was. She was misdosed the correct dose of calcium supplements by 2 prior vets and her diet of meat only basically depleted her calcium stores. (There was a very long explanation to how this works, but basically they said, she needs a good quality puppy food, and she WILL eat it when she gets hungry. Which she did after a good 6 hours. I was just trying to get her to eat whatever she could, guess I was in the wrong.) My 2 vets and I discussed spaying her and both said they couldn't recommend spaying her at this time because the eclamptic attack was diet related.
My vets let Bella back to nursing, and they monitored her calcium levels ever 2.5 days for 1 week to make sure they didn't go down. Which with proper diet and supplements they didn't!!!!
She since gave birth to a 2 pup litter and with proper diet and supplements, not one issue with any low calcium levels. We did have her tested at 2 weeks after whelp, and they were on the high side of normal!!! So I am extremely careful with the calcium. I have 2 large bottles of calsorb on hand plus 2 bottles of canine calcium supplements for nursing dogs.

I can only hope and pray with the knowledge I have acquired that my T Bell will not have any low calcium issues, but am very worried with us also having what we believe to be a 6 pup litter!