When a lonely young girl connects with an online friend who turns out to be the past version of her deceased best friend’s mother, they must collaborate across different time periods to change their intertwined destinies and rewrite a tragic fate.

I like the authenticity of this idea of conversing with the deceased through this line of connection. What is unclear to me is what is their collaboration to change the past? Would it be better to potentially have the best friend and the mother alive now, however the mother converses with the girl to inform her of their demise and what she needs to do to change their fates.