Hj
I am not buying into the suicide theory, but this method has merit. If it's effective, and you are somewhat passive in your own demise, it's possible she did it this way.
Wander into the mountains, miles away from the nearest person and medical care to be certain a Good Samaritan will not save you. Eat a ton of Tylenol and drink your favorite alcoholic beverage to numb the pain while the Tylenol kills you. Once you ingest the pills, you are too far away from anything even if you have second thoughts. Most people may not choose this method because it's not quick, but it would certainly fit this scenario in particular.
Just to kind of add to this:
I believe Maura really - for a lack of a better word - romanticized the stories that were in the book Not Without Peril.
From the hikers I have heard describe their take on the book stories, the deaths depicted were pretty nasty ones, however, the methods, instincts, improvisation that was done to try and survive, spoke largely about some very strong-willed people that unfortunately met their match when it came to the mountains and more importantly the weather, but went down with one hell of a fight nonetheless.
Could Maura maybe have intentionally put herself in a position to where the odds were completely against her (by drinking and taking Tylenol PM while being totally exposed to the elements, to see what kind of real fighter she really was?
To me to put yourself into that position, you must be willing to sacrifice your life and give up everything.
Maybe Maura just got to that point where her regular life just didn't matter anymore.