This is a little strange?
Is she still really protective of her babies? She might be, she hangs around close to them
Is she starting to egg back up? again, she might be, she is getting the purple belly back, but its only been about 1 and half to 2 weeks since she laid this batch
Does it only happen when the male gets close to the babies? no, its all over the tank
What size tank do you have them in? a 17 gallon
The male could of simply stopped protecting the babies, and she is taking him as an intruder when he comes too close, which would result in her chasing him away.
I have never had any problems like this with my Kribs.
-FHM