Is this right?
A friend asks if you'd finish a quilt she started.
You give her an estimate, discuss what she wants, and start working on it.
You then give her a firm price of $250 because you will have to buy backing.
She balks and is rude to you, in your opinion (we cannot hear her tone of voice remember, it could easily have been sarcasm).
Now you are confiscating her quilt, plan to sell it and keep the proceeds for yourself.
Is that all a friendship is worth to you? Nine hours of doing something that you say you love to do anyway?
Return it to her, as is, and chalk it up to experience. All you have lost is time. Never again do business with someone before you have a written agreement in hand.