And, let's face it, she's not doing too badly, is she?! With roles in Ordinary Lies, Our Girl and the upcoming Tina and Bobby already under her belt!
Michelle, 29, shocked fan fans when she announced in 2013 she was walking away from the cobbles after six years playing Tina McIntyre.
Her final scenes aired in 2014.
Speaking on BBC Radio 1 Breakfast Show, Michelle admitted: "It took me two years to decide to leave. It wasn't an overnight decision. I just thought to myself, 'I don't want to look back and think what if?' That was the biggest thing for me.
"I could have stayed at Corrie the rest of my life. It was a great job and I loved the cast, everyone there, the character I was playing. But the reason I got into acting is to try new roles and see if I could challenge myself, so I just made the decision.
"And I got killed!"
Michelle's character died in her final scene so there's no hope of a Keegan return in future! "There's no going back there," she joked. "I fell off a building and got beaten up with a crow bar. She's definitely not coming back!"
The star went on to say she's quite liking the buzz she gets now from not knowing where her next job will come from, even though it's also pretty scary not having her career totally mapped out.
"I have to audition all the time," she said. "I like the buzz about it. You don't know what you'll do one job to the next. Now I'm a free agent and I don't know what I'm going to do next. I have to go for auditions again. It petrifies me! I hate it! I'm not someone who thrives off auditions. I hate them! But it's part of the process."
Michelle's latest role, as army medic Corporal Georgie Lane in Our Girl, debuted on BBC One last night. The storyline follows Georgie as she heads to Kenya on a dangerous humanitarian mission. It continues Wednesday at 9pm on BBC One.
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