There is bacteria in the urine but there is also protein. Now an infection can cause protein to appear in the urine. She probably also has some swelling around the ankles, not unsurprising in pregnancy. However, the triad of high blood pressure, protein in the urine, and edema also is part of the condition called pre-eclampsia. When you add neurologic complications like her seizures, it is defined as eclampsia, which is a medical emergency.
Treatment is delivery.
I'd have done a c-section, but you can induce a natural delivery. So they go to emergency section. So they discovered the blood during the section. Her clotting factors were being used up so fast she couldn't perform normal clotting where needed, at the incision site. So she bled out, coded, and died.