I think you did brilliant mate, I would have freaked out as soon as she caught me, lol. But really handled it well, the mother hens can be a pain but you sometimes need to give them some loving and attention befor proceeding.
For example always handle the alpha female first, she is the boss, and she needs to verify that you are a good guy, so you would have to focus on her, once she confirms that you are really no threat, you can talk to the other girls. But just remember take her on first, head on, this is all about if you are manly enough to not take crap from no one. You negged her which got her pissed. Remember, the "Is she always like this?" neg is normally for your target! Not cockblockers.
I think that if had I had the guts I would have done something like this. Looked her straight in the eye and said "O really? (cocky funny) or do you just need a hug?

" Then if she excepts hug her, if you can lift her up, and then say, "Well, I guess you were right about my line, because I did just technically pick you up" else just say "That wasn't so bad was it? But I still need an opinion, what do you think of introducing me to your friends

" if she rejects the hug offer, (which I kind of expect), directly lower her value, this is your last resort. Say something like "You're no fun... I guess some people don't like making friends..." In this case she has protect her dignity and say some crap which will make her status equal to yours, or if she insults you she will be considered a bitch. And, then proceed with a story, because you have opened. And, start focusing on your target etc. Just routine.
During all of this make sure you have a lot of confidence and keep the other girls attention. Shouldn't be too difficult if you take the mother hen head on.
Ok, enough theory craft. Don't even now if any of that will help
