Cat gave birth last night acting super anxious?

My cat gave birth last night to five kittens... the runt ped away this morning... :( I was wondering why she is acting so anxious now though... it's like she doesn't know whhat to do... she'll get up and try to eat and then start freaking out and run to the box, she lets out such a terrible meow... :( I don't know how to help!!!! PLZ HELP!