Essentially, yes. It's probably supposed to be Keis, who was the subject of Sisk's ask blog on Tumblr and was canonically a mother at some point. The line between OC and 'personal character' on this has always been a bit blurry to me, but I admit not digging too deep. Posting issue tweets referring to the OC daughter is new though.What daughter? Is that a made up OC?
Edit, since I don't think it's been mentioned in forever: The Ask Keis blog was sort of how Sisk got on most furry radars. At the time it was kind of unique and quirky and a whole new take on Sergals. A vaguely awkward but competent, relatable character as opposed to unholy rape machines in the Rain Silves 'old canon' mold. Then there were mod blogs relating 'issues' in their life, that might make the blog go away... And that vague reference was the mess we know today.