Some good points above by
@realanastasia, but allow me to add a few comments from a pharmacist perspective:
1) Methamphetamine is not a drug used for ADHD, but an illicit drug not available by prescription. Prescription drugs are amphetamine and/or dextroamphetamine which are structurally similar but different to methamphetamine.
2) I'm not too convinced that her olanzapine and citalopram caused her hyponatremia, considering that she also had dehydration (this is known as hypovolemic hyponatremia). Olanzapine has a very small risk of hyponatremia (low sodium). SSRIs including citalopram have a greater risk than most atypical antipsychotics but the risk is still relatively small. However, what's crucial to note is that in these cases, typically the hyponatremia is secondary to SIADH, which causes water
retention. This is known as
hypervolemic hyponatremia, whereas Jasmine had
hypovolemic hyponatremia (that is, dehydration with low sodium).
Of note, olanzapine more commonly causes drowsiness, dizziness, and orthostatic hypotension which all do indeed increase risk of falls, however
.
3) Most common cause of hypovolemic hyponatremia is vomiting and diarrhea, where you lose both water and salt. Methamphetamine toxicity causes vomiting (and less so, diarrhea).
To me, I think the key here is the methamphetamine overdose. That in and of itself could have caused enough vomiting to induce hypovolemic hyponatremia especially if she was already dehydrated from inadequate water intake. Was there evidence that she had been vomiting recently? If so, this paired with drowsiness/dizziness from olanzapine would have disoriented her enough to stumble and fall, leading to the blunt force trauma. My understanding is that blunt force trauma does not necessarily mean someone else was involved, but could just mean you fell and hit an object (or fell down stairs).
IMHO, her unfortunate death is most likely accidental.