Thing not Tiger. She was ashamed of a part of herself that she could not hide and could not accept and as a result she had no control over it.
"There is no shame in what you are. The Tigress is a beautiful creature to behold and she is a part of you. She is not a separate entity to yourself" Hannibal said softly, yet his eyes showed the extent to his conviction at this. She had become dependent on the drugs in order to avoid her real issue with confronting what she was.
He also could see the opportunity here. Were-Tigers were not common but a Fae/Were-Tiger hybrid? An unheard of opportunity. He would help her of course but there was no reason why he could not study her in more detail. He was quite sure that at this moment she would do anything to obtain the drugs that she craved.