Here, a lot depends on the active quest. If Celica doesn't have a body, it can usually be found somewhere on the ship or after talking to Clara or some other girls. That is, it is impossible for Celica to be left without a body. Also, check the quest menu. It might tell you which characters on the ship have quests.
Problems can occur when using an old beta version of the game. For example, the version 0.70.001, already beloved by many players, which became outdated at the end of August.