My deepest sympathy for your loss.
The toxicology test will determine what medications she had in her system at the time, the levels in which they were present and if they were at theraputic or toxic levels.
Some examples of what will show up on the toxicology screen will be - caffiene, nicotine, OTC medications, RX medications, alcohol, etc.
You should be able to look at the ng levels to tell what is theraputic and what is toxic.
Take care.....
PS - if you have any more questions about autopsy or toxicology, feel free to send me a PM.