The fallout after the Cerberus attack on the Citadel is one of the greatest missed opportunities by the writers of Mass Effect 3: especially if Ashley is the Virmire Survivor! Given Ashley`s family military history. I think the Council and Alliance would have been more suspicious of her... The fact that she was the only surviving operative left guarding the Council is suspect. It reminds me of how Shep can read a report on Eden Prime of Cerberus operatives making it look like they were trying to kill one of thier own when they weren`t. And hell... even Diana Allers has quite a bit to say about Ash yet another "miraculous" survival.
It would have been great for Ash to expierence some of what Shepard went threw in 2185. People doubting him, not trusting him, turning there back on him or scandalizing his name. Because as knightnblu once said in his thread: Is Ashley still your girl? On Horizon (and after) Ashley sort of treats Shepard like everyone else treated her grandfather, but she fails to recognize this.In 2186 even though Ash sent Shep an email apologizing for her behavior on Horizon we discover that she and Shepard just happened to bump into each other on Earth. Ash had been distancesing herself from Shep, she hadn`t visited him once in the last six months and had no apparent intention of doing so anytime soon.
So now imagine Ashley under house arrest (or in some secret prison) like Shepard was at the begining of ME3. No contact with the outside world. Her family not knowing what to think. They say "Death before dishonor." A situation like this could make Ash suicidal. She did nothing wrong (except behave like a status ****, point her gun at a REAL Spectre and the man the Systems Alliance charged with building alliances for the fight against the Reapers) just like her grandfather General Williams, but heads have to roll and Udina`s is not enough.
And storywise -- I think it would have been a good move for them to go down this road with Ashley. The player would have been given a choice (just like with Engineers Daniels & Donnely) let Ash sit the rest of the war out in prison or vouch for her and give her a chance to redeem herself...
But that`s not what we got

No, what we got is Ash `chillin like a villian` waiting by the Docking Bay after the Cerberus Coup to have a word with Commander Shepard before he returned to his mission.