No, that's not ok that she's not moving or eating, and not getting back to normal. It indicates a likely health issue, and a critical one. She could have pregnancy toxemia from low blood sugar levels(hypoglycemia) or possibly low blood calcium levels(hypocalcemia). Both are extremely dangerous and can be fatal. There are other possible pregnancy complications that could be causing her lethargy and lack of appetite, but hypoglycemia and/or hypocalcemia would be the most common and likely.
If it is this and she still is alert and taking things orally, and her condition isn't too severe yet, I know some breeders will crush up a tums, mix with water and syringe it orally to help restore sugar and calcium levels. However, if it's progressed too far, then immediate vet intervention to administer the glucose and calcium is necessary, as it will need to be given by IV.
https://vethelpdirect.com/pet-health-library/condition-rabbit-pregnancy-toxaemia/
Hypocalcemia in rabbits
Another possibility for the mom not doing well can be a uterine infection developing after giving birth, or other post pregnancy complications. And these require immediate vet intervention.
As for the kits, they need to have been fed by the first 36 hours after being born. But if mom is having problems, it may become necessary to start hand feeding. This is a last resort though because risks of them aspirating from hand feeding are high, so I would only do it as a last resort to help save the mother rabbit if her health is compromised.
https://flashsplace.webs.com/accidentallitters.htm