Celestria might hate her now, but Amanda had no other way other than freezing her legs and knocking her out instantly after.
After all, being hated was far better than letting her friend die.
When Celestria and Amanda heard the reverberation of battle and Alex's cry, the Princess was about to walk out of the room even though they both knew that the soldiers of enemy forces had surrounded the palace and were guarding each room.
Amanda had no idea who these people were but just their presence alone told her that they couldn't defeat them. Not when there are hundreds in numbers.
As such, the best thing Amanda could do and hope for was Alex's victory. Celestria was crying even while unconscious; however, as much as it hurt her, Amanda felt this was the correct option.