I'm going to yell at my sister for eating my 45 dollar cough drops
You're certain she ate them?
I just want to know why she did it.
Tell her those cough drops are important and that you need them over normal ones. They're also highly expensive and she needs to pay you back.
She didn't cry or anything. She just kinda said sorry.
That is good that she understands.   I would keep your cough drops in a secure place in case she is not sincere.