The phrase can imply emotional security when used for family, showing love and commitment. She feels completely safe, being under the care of her aunt.
Pro Tip 2/3
Responsibility Transfer
Responsibility is given to someone else, indicating trust in their ability to protect or guide. During business trips, his pets are under the care of a trusted friend.
Pro Tip 3/3
Temporary Situation
Often used to express a temporary arrangement rather than a permanent one. The students are under the care of a substitute teacher for the week.