Cat gave birth, she is freaking out... what to do?!?!?

I would put the two older kittens in another room as far away from her as possible. They are getting stressed out. My neighbors very loving cat attacked my feet and gave me a very nasty bite on the leg when I walked too close to where the kittens were . Thats normal behavior unfortunately. I think you really need to separate them; this is also stressful on the new kittens.