If she is not interested in eating the kibble, than offer her canned food
I would not recommend home-cooked food during pregnancy because it is vital that she receives a well-balanced, nutrient dense diet at this time. There is too much room for error in home-cooked fare under the best of circumstances; trying to balance calcium:phosphorus ratios, protein, fat, and carbohydrate ratios, and trace elements in a pregnant female is just too tricky without extensive study and consultation with a board certified veterinary nutritionist.
There are several good quality foods- Royal Canin, Evo, Innova, Diamond, Eagle Pak are all good brands.
Yes, de-worming is safe and recommended during pregnancy. Intestinal parasites may encyst in muscle
at any point in the dam's lifestages; during stressful events like pregnancy, whelping
, and nursing, these encysted parasites may recrudesce and infect the pups through the placenta or milk. De-worming every 2 weeks for 3 doses prior to whelping helps to cut down on possible transmission of intestinal parasites to the pups.