Send massage.
Honestly, the dog gags work without her talking. Other than that, Seeing Stars is her latest focus episode, the last one where she needs to talk. Not like they forgot she exists, she still pops up in the background. I don’t know how much the happenings in Erica’s life are affecting Loona’s speaking lines, since she claimed a lot of it was recorded before her SO passed away. I think it’s just a string of episodes where she doesn’t really get more than a silent gag.
I remember some people complained she was somewhat a pointless tagalong in S1E5 and didn’t need to be there. Kinda funny how her usage within plotlines changed since then.