I began to have my suspicions about Aloe back when she first awoke and started acting a bit strangely. However, I easily chalked it down to many other factors.
Training also revealed a lot of inconsistencies in her character, but I gave excuses for those too. Besides, I had checked her using Magic, and there was nothing suspicious about her in the slightest.
Then, when we teleported to the Nether Cult's headquarters and got separated; I slowly began to come up with explanations for the cause of the incident.
There was a strong likelihood that my Spell was interfered with when we teleported. Thus… suspicion fell on a member of our team. Once the inconsistencies added up, a justifiable basis of suspicion was formed.
Now that it had been confirmed by the recent series of events—as well as the direct confession of the party in question—I no longer had any doubts.
'This is Aloe's body, but… she's not Aloe!'