Alba I know exactly how you are feeling, my youngest daughter (sorry darling if you read this) did a moonlight flit when she was 16, I was beside myself with a mix of emotions.
The next day I came home from shopping to find a note on the table saying she had popped in for some more stuff and borrowed my gloves! My initial thought though fleeting was to change the locks.
Of course I didn't and the open door policy did work, she came back a few times between rentals and she is now a fully grounded married lady with a beautiful son.
They test us all the time, let them go with love and they will always return.
Mamya ♥