The idiom at the end of the day means when everything else has been taken into consideration, but this sentence describes a situation where she didn't consider anything else
Consider the statement "without taking anything else into consideration, she had chosen to do what she enjoyed most - working with young children.". Based on this "at the end of the day she had chosen to do what she enjoyed most - working with young children." a true statement? Yes, no, or I don't know?