there should not be any medication for this behavior. I have only heard of mommy daughter females being successful together.
please let me forwarn you. a basenji fight is not something you want to see. if something happens, water is a good way to break up a commotion.
your older female is just being alpha, it is who she is. your younger girl is doing the same thing.
from what i have seen you can have many males together with one female and avoid problems.
I would suggest talking with Brat and placing her in a home that wants and knows the breed. please do not feel guilty for making a smart decision about something instead of waiting for something bad to happen first. take the time to place your young girl in loving hands.
you could soften the change with a male puppy….
I honestly have never heard of two non related females jiving at all. lots of people like to adopt basenjis after the puppy stage.....
keep us posted on your thoughts. what ever you decide sounds like it will be difficult.