The ongoing struggle of parenthood....GRRRR!

This entry is about two of my three children. I thought that it was interesting as it unfolded and that I would share it as an ethical choice of parenthood.
Brandi, age 7 is a very outspoken individual. There is NEVER a doubt as to what that child is thinking. She declares it LONG and LOUD!! This, of course, makes her a lot of trouble because EVERYTHING about her is noticeable. Burgandy, age 6 is quite the opposite, very quiet - always going with the flow.... for the most part.
Most of the time these two girls quarrel as long as the day is and this is a difficult ordeal to break. There are rare moments when the two get along but before I can breathe a sigh of relief, the fighting begins again: "She started it", UGH! I rest my case.
On this particular day, my significant other (who has a great deal of trouble with Brandi - because the two of them are so much alike) happened to see Brandi wave her hands in her sister's face and despite Burgandy's request that she stop - continued to do it. My SO, Troy punished Brandi with a time out for not stopping as her sister had asked. Brandi made a HUGE ordeal about the time out and ended up having to have additional time added on.
Later, when her time out was over, I called Brandi over to me to talk to her about what had happened and to help her understand that there were other things she could have and should have done. Troy had to leave prior to the end of her discipline so I was operating solo on this one.
Brandi revealed to me that Burgandy was in fact the one that was putting HER hands in HER face - something that I vaguely recalled seeing occur, but for some reason didn't tie it to what transpired after that. I told Brandi that I did in fact witness this infraction on her sisters behalf and that should this occur again, she should remove herself from the situation. If Burgandy continues to follow her, then to come to me or to Troy and let us know that she has tried to remove herself from the situation; to no avail. Then, we will deal with the offender - her sister.
I then told the two of them to play nice and sat back and watched the two of them. The same scenario played out in front of me once again only this time, Brandi did as I had suggested and removed herself from her sisters' presence. Burgandy followed her and continued to try to get her goat. Then Brandi came to me and told me what was going on.
When Troy returned, I told him what I had found out from Brandi and that I knew she was telling the truth because I had seen that incident. Troy and I then had a talk with Burgandy about trying to annoy her older sibling and/or trying to get her into trouble.
Hopefully, this lesson will not have to be repeated but I think that it is significant with parenthood of children that we need to look deeper into the issues at hand and not just rely on what appears to be on the surface.