In the last picture she is 10 or 11"
I had trouble getting my pair to spawn untill I put them into a 55 alone. It's kind of funny that when they were in a 120 they wouldn't spawn and it didn't seem to matter if I had other fish in it or if they were alone but as soon as I moved them into a smallertank they spawn like clock work.
Hope it helps....
BTW Do Jags have to choose their mates? I don't really know but the 2 pairs I have act like they might because they stay together all the time, even when it's not time to spawn and they don't wander away like my other breeding ciclids do when it's not time to spawn.