Oh, well, even trying to realize that the victims were infected by a love virus was also hard.
So many people knew about Ainsley's love virus already, but using the virus, Ainsley could brainwash them to believe that they were not infected at all.
If they didn't behave too strangely, others around them wouldn't realize that the victims had already been infected by the live virus.
Then, as the people around the victims were infected one by one, no one would remind the victims that they were under Ainsley's charm!
The battle angels were like this.
Ainsley didn't panic after the effect of the love virus disappeared.
For the time being, she didn't need these angels to do something for her and so, Ainsley focused on the battle outside of the barrier instead.
To be honest, with Gabriel leaving the battlefield, there should be no one stopping Satan.