Cant remember movie please help?!

A few months ago i went over to my sisters house and she was watching this move on LMN i think and i only saw the beginning and it was about a lady who had a perfect life with a perfect daughter then she went one day to a park and she was going to get her daughters sweater from the car then she sees her daughter running across the street and a truck about to hit her so the lady runs and saves her daughter but get hits and wakes up in a hospital like in an alternate universe where her name is different and she never had a daughter!. thats all i remember!. please help!.Www@Enter-QA@Com

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