When Flynn told the Russian ambassador that Trump would lift sanctions, he was undoubtedly doing exactly what Trump wanted him to do. Which is why Trump didn't fire him when he found out last month. Didn't fire him until the general public found out, at which point he became a political liability.
Conway is getting there. Alternative facts, Bowling Green Massacre, selling Ivanka's clothing line on Fox, "Trump has full confidence in Flynn" an hour before he gets fired, and all kinds of other things suggesting that she doesn't even know what is going on in the Whitehouse. Doesn't matter how loyal she is, whatever good things she did for him in the campaign, or how much he personally likes her. If she continues to act like a clown on public airwaves, he'll have to eventually get rid of her.
How much you think Trump enjoyed this little exchange between Conway and Jake Tapper?