^I also think that Takahashi Ai-chan wouldn't say this to the press, especially the tabloids.
But in all respect, it likely how Ai-chan would think, heck most people would be that way, too. If anyone is in her position, they probably would feel the same. No matter how much love you have for your career, job, hobbies, etc., after going at it nonstop, one would normally feel fatigue and stress which requires rest and relaxation and time to clear their mind before continuing. but with the work schedule MoMusu have, even their time off isn't really enough and they're still young, they started this in their early life, they might not know how to handle stress and fatigue properly and let it affect their mentality and their thoughts on idol life.
Plus Ai-chan and Gaki-san both are in MoMusu for 8 long years, more so then any members and the responsbility is on their shoulders. Alot of pressure, for sure.
Though I would hate to hear Ai-chan, Gaki-san or any members graduating at such a time now, but for physical and mental health concerns, I can't deny them. I can only hope that they can handle such stress and pressure, able to relax and not graduate so soon.
Even if they do, I hope they'll still continue in the music/idol/entertainer path so we won't miss them as much.
Ai-chan is the greatest vocalist, an amazing performer for H!P right now, losing her would really hurt them, and us fans.
Ultimately, hopefully UFA can get out of their troubles (i.e. management, promotion, popularity) and properly/rightfully promote and train Momusu, H!P and all of the members, so popularity and profits can rise. that way, Ai-chan won't have to carry such a huge burden as leader of MoMusu and H!P and she can continue. Also, if other momusu members can get more lines, Ai-chan won't have to work so hard. I know Ai-chan is the best singer in Momusu currently, possibly the best of all the members, including the graduated members. But it also increase that pressure and fatigue. Train the other members more, especially Sayu and Koharu. place more in the spot line, have the other members shine, so that the can take over once the time comes so Ai-chan won't worry as much and MoMusu can keep going. Hopefully when the time comes, Ai-chan can leave MoMusu in good hands without having to suffer.