@Ronoso I've heard about people who have done precisely that on "spirit journeys", so it's not an unheard on plot device. That said, can you imagine how sucky it would be to wake up & find out that the love of your life, whom you former all of those memories with weren't real in the sense that you hoped?
On the other hand, since experiences are partly cognitive, one could argue that that experience was in fact a blessing for it meant that she got to experience a life she might not and that the boy & story awaits her in her dreams. :3 You can use the old "brain in a vat" excuse whereby what is real vs simulation is debatable, thus could this reality be VR & we be merely a brain in a vat? As such, if she can live two lives—she doesn't have to feel bad about not seeing her family, because she can see them whenever she wants. By waking up she can have more than one life going in parallel without "cheating" on any one party. Though, I'd lulz seeing someone try to explain that scenario to their significant partner(s).
Maybe, in an unpublished sequel, the ML in fact was also transmigrated and thus meets his future bride only for them later to discover that they have been living two lives? :3
[Fantastical Fandom FT Band-Aids for your significant random woes.]