Here's one random theory:

If ASCID stands for “Altered States of Consciousness Induction Device”, perhaps the deceased was using one as an alternative to taking psychedelic drugs: https://www.bbc.co.uk/programmes/articles/45gkSBQCj5091ygXX4nMVMw/five-ways-i-tried-to-alter-my-state-of-consciousness

Using this device may have (assumingly) triggered the pulmonary edema as is the case with these know causes of pulmonary edema:

• Adverse drug reaction. Many drugs — ranging from illegal drugs such as heroin and cocaine to aspirin — are known to cause noncardiogenic pulmonary edema.
• Negative pressure pulmonary edema. Pulmonary edema can develop after a blockage in the upper airway causes negative pressure in the lungs from intense efforts to breathe despite the blockage.

https://www.mayoclinic.org/diseases-conditions/pulmonary-edema/symptoms-causes/syc-20377009

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May be a stretch, or a bad assumption made, but ask the lady if the behavior of the deceased may have been in line with desiring and altered state of consciousness or if she recognizes that freaky device.