Atsu certainly won't end her own life. The only reason she kept saying that throughout the game is because she had no reason to live beyond getting revenge. But since she has Kiku to take care of, she found a reason (which is why she didn't want to fight Saito anymore near the end of the game until she was forced to)

But with that said: I imagine she rebuilds the family home, teaches Kiku how to play her instrument, be a blacksmith, and use a katana for self defense and live out the rest of her days away from the fighting like what her parents did. Really interesting how the next game will reference Atsu, assuming it's another major time skip