my budgie is about to lay eggs

my female budgie has been all puffed up and sleepy for three days, i thought she was sick, yesterday i took her to our nearest vet and he said its her breeding season, she will lay eggs, she’s active so dont worry she’s not sick. he told us to bring a pot for her and give her multivitamins in water. i bought her a pot and laid cotton in the bottom but she wont go inside even once, she refuses to drink water, shes not drinking water at all, she just keeps eating seeds all day, eats boiled egg and eats her poop all day long, she’s still puffed up an looks weak 🙁 i dont know what to do please help me