More words of caution... Never, Ever allow strangers in your home if you are alone!!! If you want to sell from your home you should Always make sure you have another person in the house with you when people are coming to see your items. A friend, a relative, someone.
Never, Ever let strangers in when alone!!!!
This could have been a lot worse than losing some quilts.
I hope she called the police right away. If not she needs to. And, make sure you always have pictures and documentation for each item so they can be identified if found.