You need to test SN with aquarium test kit. There were threads of how to do it , blood test is not sufficient.
Just found another about saed, read all of it properly (this will give some information about SN testing too)- https://sanctioned-suicide.net/threads/sn-test-poland-vendor.41693/page-2
It is not clear for me which one she used on the day, but do a bit of investigation and you might find out