Yes, momma will need a lot of calories when she is nursing her kittens.
Canned food only as she needs a lot of fluid too. Check the label for meat content, no grains, corn etc as those are wasted calories. If you can supplement her with some raw human meat that would do her a world of wonders too.
If you can afford better quality cat food then here are my picks:
Wellness, grain free varieties (yellow triangle in the corner). This comes in the larger canned size to economize
Nature's Variety, Instinct canned
A less expensive brand but still good quality is Felidae canned. It also comes in the larger can size so you can economize with that brand too.
You can only find these foods in quality pet food stores, not the grocery store.
How is momma doing?
After the birth check on the babies to ensure they are all nursing. They should be weighed at least every second day to ensure they are gaining weight. The norm is about 10 grams a day.
You can start weaning the kittens at about 3.5-4 weeks old. Water down the canned food with some kitten forumula to help entice them.
If you are using clumping litter, please remove it from the kitten area once the kittens start walking. They will try to eat everything and the clumpling litter will clump in their tummies and cause them blockages which could lead to death.
Cat maid to:
Jasper, male Ragdoll ?? (approx 10 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 7 yrs)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey