She has an attitude on her. I wish she would have worked in my tank I have searched for a while for a rio tapajos and wish she would have worked in my tank. Since she has left I think my shortbody pbass is going to spawn with my other mono Pbass they have cleared two areas to spawn. So maybe you will be taking some shortbody Mono fry soon to join that tank.
Marms are very rare in the hobby, at least in the US. I have/had a pair of "rio trombetas" that are about 14" plus. They are at my buddies house currently.