I think it's too early to think about the ending just yet, but if you want to, I suggest the 9-act structure.

http://hs34.order-vault.net/~admin16.../nine_act.html

Also I note this:
“We talked about you having authority here, and I am going to try to use as a rule of thumb, if you see me say it or do it, you can do it.” He let that sink in.
With that in mind, and the stuff around it with the Scoobies, it sure looks to me like Amanda is being trained as a Domme. I don't think you need to make her mirror her mom in any obvious way, but perhaps a non-obvious way would work. (Maybe for example she grows up an excellent kinky Domme but has to take humiliating jobs in Real Life, working for snarky domineering bitches like her Mom used to be.)