I think a timeline of texts will help clear up some of the confusion here. (though, I don't think we will see the complete picture until trial, should this make it to trial.)
Has anyone started a timeline?
A few things that stick out.
July 10, 3:00 pm (appx) MC texts friend that Conrad can't be found and she texted his mother to see if he is alright.
July 10, 3:15 pm MC receives text from Conrad
July 11, evening unknown time, MC texts a friend stating she still hasn't found him and is a mess.
July 11, evening, approximately 1 hour later MC texts Conrad and asks him "let me know when you're gonna do it"
July 11, late evening. Texts her friends telling them it is her fault Conrad is dead.
July 12, MC spends day speaking with and texting Conrad via phone.
July 12, Last contact between MC and Conrad approximately 6:26pm.
July 13, Conrad's found deceased in his pickup truck behind a store.
http://www.southcoasttoday.com/article/20150227/NEWS/150229466/101194/EDU02?template=printart
I'm sure there is more detail to the timeline between July 10th and 13th when his body was found. This gives us an example of how much time she spent discussing this event with him before it occured. She had days, not hours or minutes, but days to attempt to help him. She did not.
The length of time is where I see the problem. This isn't a momentary thing, or a few minutes where a teen has to make a quick decision and made the wrong one. She had at least 3 days to reach out to someone and try and get help for Conrad.
Some unanswered questions. Did she really text Conrads mom prior to his committing suicide?
Was she communicating with him while he purchased the items used to commit suicide?