I'm sorry for the loss of your friend.

I hope this can provide a little insight

An embolism causes low blood oxygen and low blood pressure.

The treatment is:

Medication

Oxygen a breathing tube can be inserted in your airway.

Arterial catheter

Central venous cathether

Replacement fluids, blood, blood product or blood alternative transfusions.

Risk factors:

Being over 35.

Placenta abnormalities

Preeclampsia

Cesarean, forceps, vacuum delivery.

Genetics

Medically induced labor (although that is not proven yet)

Only 1-12 woman have a amniotic fluid embolism out of 100,000

The mother can die within 1 hr of the start of the symptoms. It can be fatal for baby as well.

Tests and diagnosis of this can only be done after maternal death.

Not enough is yet known about this medical issue and so extensive research is yet to be done.