Keep a very close eye on them. Are you weighing the kit? It's important to make sure the kit is gaining weight and that the mom's present dislike for her kit is not preventing the kit from eating. It could be that the mom was tired of feeding for the moment and just wanted some quiet time, but it's hard to know because you haven't given much of a description about what took place.
If the mom continues to go after the kit you are going to have to start hand feeding the kit.