Rey had a baby while really young and struggling to get by, so she gave the baby up for adoption. It was the hardest thing she ever had to do and it still haunts her, but she wanted her kid to have a good life, even if that life didn't included her.

Some years later she comes across a lovely couple, Finn and Poe, whom she becomes best friends with. Eventually she meets their adopted kid and becomes a big sister/cool aunt figure to them. Then she starts noticing that Finn and Poe's child kinda looks like her. And has a lot in common with her. And is exactly the same age as the baby she gave up...

Cue Rey panicking and not know what to do. Tell Finn and Poe? Not tell? Will she accidentally give the kid emotional problems? Will they think she faked being their friend to get close to her child? Are there gonna be custody issues? Should she leave and not be involved? Stay and let the child know she loves them?

Up to the filler how this goes.