Looking Back Through Time!

Time indeed is a bitch!
It teaches us only through experiences. Experiences that doesn't repeat itself. And after everything ends, we regret the times we didn't do anything.

Life is at its twilight for Tamanna while she counts her last breathes. But unlike any other her age she doesn't counts her blessings or her good and bad deeds to decide whether she's gonna go to heaven or hell. Rather she regrets not living her days to it's brim.
She is so regretful that it becomes impossible for the Angel of Death to drag her soul to the afterlife. So she is given a second shot at life, but it's also the last one and there are rules too.
She will get back to life only from the time she stopped living life and began surviving which was since her high school days because studies got harder. Second, fortunately she will retain all her memories of a lifetime so that she doesn't repeats the same mistake. Her mind will be of an aged person but body will be of a young girl. Third she will not be able to mention about the future to anyone cause they won't be able to hear it. Fourth, the ending of life will remain the same and all the big events. She will be able to change only the details to them which made all the difference. Last and the worst, time will jump through leaps and bounds for the times she regreted. The Angel of Death will keep reminding her of the tiking minutes.

When she takes a leap through time will she be able to let go of all her regrets or will she end up with the same once again?