Turns out she seems to have died of egg binding.

Main emergency : The male is still incubating. The pair had 5 eggs of their own + 2 Star finch. Should I let the male nests alone or will it be too stressful for him?
Second question : Its the first time I had an egg binding case and Im unsure what caused it. My breeding brids have access the seeds, egg food, insect food, fresh food (spinach, cucumber and other vegetables and leaves), mineral block, cuttlefish bone, crushed eggshells + coal. They have full spectrum light + some natural light, they are in a quiet room. They have flying space and I keep the flight cage clean. What could be the issue?
Thank you in advance for your help.