I am in agreement, too.
She infantilises Tiffany and is in a codependent relationship. None of this is healthy for Tiffany or promotes strong independence and mature survival skills. She has raised a child into a 30 year old child who needs to be taken care of, not a contributing proud member of society, family member or partner. Just the fact that Tiffany openly states she needs time off from family and friends is indicative of nonreciprocal relationships: she wants "time off" from the people who should be supporting her! Not to take on the responsibilities for herself, but instead, it places even more burden on the two who already shoulder so much and who baby her. Her relationships appear very one-sided with all the efforts flowing towards Tiffany. I have never heard her mum put up any resistance, refusal or a single word of complaint, not even a raised eyebrow, at Tiffany's infantile behaviour.
I'm sure Amma would lay down her life for her daughter, and it must be torturous to see her so seriously ill. But even for the benefit of Amma's own physical wellbeing, Tiffany needs to be given opportunities to stand on her own wherever she can, and feel the self worth and pride in that. I can't imagine Matt's burden if Amma becomes ill. Tiffany has no interest in taking care of herself and has not shown any interest in learning how. Matt and Amma have enabled this learned helplessness in her.
Yes, she was happy for the publicity onto herself, but has done so little to use her spotlight to help others. That is such a shame. Tiffany doesn't see others with cancer as anything but a blight on her own mental health, an irritant to
her.