Back when Gabriel Stevenson injured Helen, she suspected Clarke Ainley, but in the middle of the investigation, many clues went cold.
The reason these clues went cold was because William Hall intervened.
Additionally, with William Hall sending people to the hospital to kill Helen Melendy, naturally, Elly Campbell turned her investigation towards him.
And Clarke Ainley's actions during Helen Melendy's coma were, just like an elegant green tea, other than trying to happen upon Harry Hall at the hospital, hoping for a relationship to bloom from long interactions, there was nothing else she found out.
Also, with her security staff at the hospital watching closely, neither Clarke Ainley nor her people had any chance to get close to Helen Melendy, which allowed Elly Campbell to relax.
It was only after Director Montgomery told her that Helen Melendy had been poisoned for over half a year that she began to reinvestigate Clarke Ainley.
