Dude, you still have to provide sources of information to give credibility to your claims. If you don't, you just come off as spreading more lies/false rumours like a lot of the ones that show up on 2ch. Without actual proof to show that what you're saying is true, nothing you say about this will be believed/taken seriously.
She basically had no time to go to hospital when she was under UFA.
No time to go to the hospital? No offense dude, but that's just a ridiculous thing to say. If/when a person is so sick that they want to go to the hospital, "finding time to go" is never an issue. If it's THAT serious that they feel they need to go to a hospital, they just go.
When she asked to go to the hospital, UFA refused.
Unless UFA had some security guys actually following her and PHYSICALLY preventing her from going to a hospital, there's no way that they could have stopped her if she needed to go. She might be an employee of UFA, but I find it highly unlikely that she would need their permission to go to the hospital, considering that her health is involved. Also, not allowing her to go to a hospital would have been a really stupid business move by UFA, because then they'd be risking her getting even MORE sick. As I said before, if/when one of your performers is sick, they won't be able to work as much and you won't be able to make money off of them. UFA is a business, and as a business they're looking for all of the performers they've signed to work as much as possible. This way they make more money.
Think back to last year when Aya had to take time off because she was diagnosed with that jaw problem. The pain she was feeling was so bad that UFA cancelled some of her shows so that she could have some time off to get better. She never asked them to cancel the shows, UFA made that decision themselves. They knew that in the long run, this was the best thing to do. They're not slavedrivers who will force their employees to work if they're in such pain. They're a business, and anyone in this business knows that sick performers/performers in pain do NOT make you money.
UFA didn't let Gocchin do what she wants to do and she judged that there would be no future under UFA.
This part
might be believable if you were ONLY talking about the direction of her musical career. It wouldn't be entirely surprising if she wanted to do one thing and UFA wanted to do another. There have been similar situations like that in the past where it ended up with the singer(s)/groups leaving or quitting.
But in terms of her health, most of what you've claimed here so far is sketchy at best and will continue to be met with skepticism and doubt unless you provide some official proof to back it up.