After the Fall of Mondstadt, Keqing, and her Friends along with MONARCH are given evacuation to civilians then Biollante appeared too soon.

Xiao: Oh no, She's here!
Keqing: Too soon, My friends and I will hold her off, you finished the evacuation.

Keqing and her friends went to attack Biollante as the soldiers fired their will.

Keqing: Cut those vines!
Ganyu: I see them.

She shot her arrows as she could the vines were cutting down as Keqing sliced them. Then Rodan arrived at their aid, helping to fight the Biollante.

Keqing: Rodan's here.

Rodan did the best he could but Biollante overpowers him.

Soldier: Damn, Rodan just, KO.

As the battle went on, the buildings were getting destroyed, and the cost went high. Soldiers shooting at her, Yanfei came to their aid to take down and Rodan tried to fight back, but No matter how hard they tried, Nothing seems to work.

Soldier: Oh man, We need to fall back!
Commander: Get everyone out of the city!
Soldier: Yes sir!

After the civilians were evacuated, Keqing and her friends took an airlift as Rodan bought them some time to escape.

Keqing: Okay, Everyone is out. Get us out of here!
Pilot: Roger that ma'am, Liftoff!

Then Tiltrotors took off and Rodan followed them as it managed to escape from Biollante then she let out her roar in triumph, A sad Keqing couldn't help but watch as she looked at the destruction of her Hometown.

Ganyu: We're sorry Keqing.
Keqing: I know.
Ganyu: What are we gonna do now?
Keqing: We'll reclaim our home next time, right now, We have to keep going.
Ganyu: Agreed.
Xiao: We must head to Inazuma for our defense.
Hu Tao: Okay.

They promised that they will reclaim their home but, for now, They have to keep civilians safe. Rodan is flying to Inazuma. In Liyue, Biollante looked at them.

Liyue has Fallen

Leaving Inazuma last line of Defense