I dunno, anon, I wouldn’t panic just yet. No one mentioned anything about her being a love interest, and SPN can always use a new important lady character! Besides, remember everyone freaking about Ann-Marie, that lady demon!Dean hooked up with that once? Or when people thought Billie was Cassie and she was back as a hunter to swoop Dean into a happily ever after. Or Amara — sure, there was this kiss thing, and the storyline isn’t over, but I don’t have a feeling they’re leading up to some epic romance between her and Dean.
Anyways, no, I don’t really share that feeling, dear anon. SPN had plenty female characters that weren’t love interests (Donna, Jody, Charlie, Abbadon, Rowena just to name a few from the last seasons), so I guess we’ll just wait and see?
And about Dean forgetting Cas… I don’t see that happening anytime soon. I mean, have you seen him call out for Cas ten times in a row in the last episode?