Qiuping Is Still Alive Outside of Hiding

I couldn't sleep the night I finished watching "Insidious". Cuiping was holding her child and standing on the hillside waiting for Yu Zecheng. I watched that scene three times. But what I was thinking over and over in my mind was not where Yu Zecheng went, but another thing - Cuiping's sister Chen Qiuping, the victim mentioned briefly in the original work, what if she had not died?