Death Stranding 2 ending explanation and learning to change later

As for Lou, well, let's review what we know so far:

• Sam and Lucy had a baby, but the baby was taken away and became part of the bridge plan.
• In the first game, Sam found a BB and he built a strong connection with her. He named the child.
• In the early part of the campaign, the fragile death, but she managed to take Lou to Neil's beach, which the organization believed was the realm of the dead.
• Neil takes care of Lou and delivers his promise to Lucy while they are still alive.
• Lou has been growing up in strange fields for years. But for us (actually), only a very short time has passed.
• A young woman appears in a mysterious realm from the midway through the campaign, and the group will name her tomorrow.
• Tomorrow, due to close ties with Sam/Amily, he was kidnapped by Higgs because she was an extinct entity.

After Sam defeated Higgs in the battle, he was pulled into the Rift tomorrow. However, she resisted the urge to trigger the extinction incident. Instead, she appears as a huge Lou, devouring Higgs.

The huge building looked like she smiled at Sam, as if she recognized him. Then, back to DHV Magellan, everyone wakes up and tomorrow /Lou approaches Sam. Then she said, “I am your Louise.”

In short: Tomorrow is Lou, and everyone grows up from the realm of the dead. And, yes, she is Sam's daughter. She recalls the entire journey they shared from the first game, her life in strange fields, time moving at different speeds, returning to the real world, and interacting with everyone as part of the suspension bridge crew.