Baby Budgie and Pregnant HEN!!!?

My baby budgie fledged yesterday but then went back in. The mother is looking pregnant from the big lump in her tail area. and she wants in the nest box so was fighting the chick who is 4 weeks 3 days. the baby just took the pain. then i got made and removed the nest box. so she doesnt fight the chick for it. I DO NOT WANT HER LAYING ANOTHER CLUTCH SHE NEEDS A BRAKE! THIS IS HER FIRST SUCCSESSFULL BABY! she laid eggs but always abbandoned them now this time she has raised her first baby with father. i had to put the baby on the pearch because i needed to take box out she is really needing to lay eggs! should i put her in another cage with nest box so she can lay but ill throw eggs away. and ill leave baby and dad in other cage.plzz help im a first timer lol so are they.