I am very sorry to hear about your Mum, but like you said she could & most likely did take other drugs as well & as your not going to know trying to recreate the effects will be near on impossible & result in you spending many days trying to convince the Nutty police that you weren't trying to off yourself, plus god knows what unintended side effects.
Have you got anyone, other than here, as in the dreaded professionals to talk too?
I can understand you are desperate, but sometimes that is the worst time to be trying these things, mistakes are easy but can cost you a lot depending on where you are in the world be that financially or medically/psychiatry related, so as much as you need to be trying these things, its really not the best time for you.
Have you spoken to anyone about your Mum's death, either MH professionals or grief counselling?
Maybe you could try writing here about your Mum, just to give you a chance to get other peoples take on what went on, where you may go from here, sorry just trying to help in all possible ways.
((Hugs))