Now Kanna is doing mostly acting work and no more dancing it seems. So her foot injury does seem to prevent her from dancing, same as Aika's injury did. Aika had better connection within UFA/H!P, thats what I understood, so doors for her opened more easily, and she is a Musume, Kanna is just a C-ute member and not even one of the original H!P Kids. But personally I think Kanna is in a much better position than Aika.
This is a pic from November last year from a play called ラストホリディ~終わらない歌 ( Last Holiday - unending song ).

Parhelion69 wrote:Wasn't she caught with a boyfriend?
I guess UFA didn't like that she was doing that and told her to stop, and her, unable to control her teenage hormones, preferred doing the naughty stuff, which worsened her relationship with the company.
That's pure speculation ofc, but a probable outcome, and seems pretty reasonable

The timeline doesn't support the speculation. The gap between that so called "scandal" and Kanna quiting was about 2 years apart. And that boy didn't resurface after Kanna quit. So the reason Kanna quite doesn't relate to that "scandal".