If you're Disney and you wanted to hire KIV, wouldn't you have someone go thru her social media and point out the troubling posts and have her remove them before hiring? The same goes for her, her agent should have been proactive in this and cleaned up her page.
it does not matter... if it was once there and it was deleted twitter is not going to lie .. someone could have a copy of it . Twitter could look bad if it got out. Easier to let her go.