Sammy wanted Chelsea to play a video game (as she's never really been into them) Really get her into the world of a role playing game!

But, you know Sammy, who never does anything by halves...

Accidentally(?) turning herself and Chelsea into Mass Effect characters, and the world around them into the mass effect universe, I'm sure they'll be having adventures for quite some time!

Not that they'll remember each other in this world, I'm not sure Kelly or Liara have that much interaction ;) But they'll both have a good time interacting with Shepard! (whoever is asserting that role in the new universe, who knows! Sammy doesn't think this stuff through.)