I saw this cute blonde today who was in a group of friends naturally I approached them and started a conversation. However, this brunette who I wasn't interested in at all started intercepting the conversation often answering all the questions etc. So I'm wondering how can I brush the "AFOG" brunette off and proceed to game my actual target in a situation like this. I wouldn't even say she was a mother hen, she just wanted all the attention.

neg her down to size...
When your talking and she answers for her ignor her, if she does it again say "man is she always like this?" and just AMOG over her, when she AFOG's it means your not Alpha and your a lost case anyways. There can only be one alpha, not one alpha per gender

Ask specific question, then go "well what about you ladies?" after mother hen answers.

I'm not an expert but maybe turn her for help? If she's not the jealous type be like can I talk to you for a sec? How good are you friends with that target over there? Well I like your friend over there, want to help me?

The problem with negging is that she will cockblock you if she doesn't get enough attention. If she's pissed you're only going for her friend, she might make the group leave and then you're fucked

Either that or you can go the "no im not buying the group a drink, just you cuz u had the balls to ask for it" and make the AFOG your target.
Also whats wrong with her wanting your attention? The only time you'll get C-blocked is if you dont handle it properly. Know how to make her crave your attention, whats she gunna do leave without satisfying that craving? I guess you need more experience to do what im asking, I kinda assume everyone is like me XD
Finally whats worse, taking the chance and seeing if she will be ok to neg-ing. or leaving and getting AFOG'd yourself? id rather take the chance than sit the f- down and take it. Obviously he didnt get what he wanted in the first place, try something else

Thanks for the advice guys I'll definitely take it into consideration.

Win her over then shift to your target.