Why did MY female guppy was extremely bloated after she gave birth to her fry and died a week later why?

The bloating in your female guppy after giving birth could have been caused by several factors, including complications from the birthing process, stress, or an infection. Postpartum complications like retained fry or eggs can also lead to swelling and health issues. Additionally, if she was not eating properly or had underlying health problems, this could contribute to her decline. Unfortunately, guppies are prone to stress and health issues, especially after giving birth, which can lead to a quick deterioration in their condition.