Ryushikaze
Deus Admiral Parsimonious, PHD, DDS, MD, JD, OBE
- AKA
- Tim, Ryu
I don't think she ever "refused" her role so much as she wanted to live a normal life while she could. Christ, she lived in a laboratory for 7 years give or take, she didn't want to go back to that. It doesn't mean she didn't want to be a Cetra, she just knew that Midgar was dangerous territory.
Wanting to live the normal life is the refusal. It might technically be a deferral of it, but the plot arc is 'No, I want normal, and avoid ShinRa. Now I'm involved. What do I want to do? No, wait, what do I HAVE to do? Let's go do that then'
I'm not sure if I remember FFVII saying anything about her 'hearing' waning.
Being secretive is different from lying, and not telling Zack's parents is a pretty dick move under most circumstances. It's a lot less of a dick move if she herself can't face his demise. Her reaction is too extreme not to care, and her not telling Zack's parents is too dickish if she does care. The 'doesn't want to admit it' tack is a reasonable medium between the two extremes.