She aint coming back...
But even if Tsukasa now thinks they're not the same i feel like she should take responsibility since indirectly she turn Yui life upside down which result on her father death. Not saying was Tsukasa fault he suicide or the she has to live with Yui for now on. But as for responsibility, i mean she cant just leave Yui now and the way she behaved made me feel is exactly was shes going to do now, like disappear from Yui like.