I wanted to write this this morning but never got the chance.
I dont think Ashley would kill herself over Shepard dying, But I would not throw it out the window of speculation.
It is at least theoretically possible. (But it is also theoretically possible that I could jump through my computer screen and give all of you a hug. Not possible now, but maybe in the next 90 to 100 years...)
Ashley survives a lot of stuff that a lot of people die from. Ashley survives Eden Prime, losing a squad full of people who love her (Not like that. As in, they love her as a Leader and as a friend, But I doubt any of her squad ever had romantic feelings for her.)
Ashley survives Virmire, where one of her best friends and XO's dies. She was close to Kaidan I think.
Ashley survives the Battle of the Citadel, where a good portion of civilians die for no reason other than the Reapers trying to come back and wipe out everyone and everything.
If I remember correctly, she also survived another Colony where she was a sole survivor as well again.
She blames herself for the death of the 212, Though, Really it was not her fault in any way whatsoever.
She blames herself for the death of Kaidan, Which she really cant do, because as Shepard says, it was his call, not hers.
She blames herself for the death of Shepard, and somewhat rightfully so. She lets go of Shepard when she lets him go and try to save Joker, Although she is not responsible for Joker's stubbornness. Inwardly, she wonders how things could have been different if she insisted on going with John. She does blame herself for him dying.
Im trying to tackle a very sensitive issue.... Would Ashley kill herself over Shepard dying......I cant really find a good way to answer. I have to say that it is a reasonable possibility, Because I dont think she dated anyone else in the 2 years that Shep was dead. I doubt we will ever know the answer to that.....
I have to say that I do believe there is a reasonable chance that she almost did commit suicide over Shepard dying. Just because of how she could rationalize the whole thing being her fault.
Also, on a side note, two other quick things really fast.
I wrote a ME3 Fanfic that is...pretty morbid but very good, A very surprising twist at the end.
And: Ash in Armor is meh to me, but Ash on the Normandy without Armor is a 10.