Picture this scenario: Raven still leaves for the tribe, but she's the one who saves Yang and Ruby after the former's ill-fated trip searching for her.
This makes Raven realize that she's been a lousy parent, and so she returned to her motherly role.
This would be a bit ironic. Raven left this family to raise the tribe. Either she got hit in the head too hard or a memory wipe.....I'll just stop there. This is a wonderful artwork nonetheless.
there was actually one fanfic where Raven returned to Ty and the girls after Samer died. But unfortunately I have forgotten its name, and beyond the beginning of initiation it did not advance chronologically.