It's a kind of interesting idea: you can speak with your younger self and prevent she made a lot of mistakes...
The think I love most is the way the future keep changing: the friends, the photos, the university even the family...
And the way both understand that they have to make their own choices. Then her future is better than she could imagine, the secret was the balance between boyfriend, friends, family and school. I suppose that oldest sisters are right sometimes.
In the end the balance allows her to have a good present, even has a little sister and maybe the possibility of calling her future self... but I think Devi has learned the lesson: she doesn't need Ivi, she can be Devi...