Should I sell my sister my car again ?

My sister bought my car before, it ran good, but had minor problems starting up. When she was about to buy it before, it didnt start, so I gave her the money back, took it to an auto shop, got it repaired, and took it back home. She wants to buy it again. It still needs minor work, but she has a mechanic that can fix it. Im afraid if it doesnt work again, she may try to ask me for her money back again. Should I sell it to her again ?