Spejcher told police who responded at the time that she had smoked marijuana before the alleged incident, the VC Star reported [3]. That marijuana was so strong that it caused her to feel like she had died and had to fight her way out of it.
Links
[1] https://themessenger.com/news/california-woman-bryn-spejcher-convicted-of-stabbing-boyfriend-over-100-times-in-cannabis-induced-psychosis-may-only-face-4-years-in-prison
[2] http://rethinkpot.org/tags/cannabis-induced-psychosis
[3] https://www.vcstar.com/story/news/local/communities/conejo-valley/2019/05/07/trial-ordered-thousand-oaks-woman-accused-stabbing-man-death/1134866001/