I don't have kids, but I do have nieces. The oldest one is almost 9 and I could NEVER imagine taking her with me. She's very mature for her age, but that has nothing to do with whether or not she can handle BF. The people in my town are ridiculous. Last year I got punched in the face over a towel. Those of us who had waited for the last few hours had formed a plan to grab as much as we could, run to the candle aisle, and then we would equally distribute them. A woman showed up about 10 minutes before go time, and kept trying to push and shove her way to the front of the pallet. No one would let her through so when the Wal-Mart employee said "GO!" she charged to the front and threw a random punch. Unfortunately, that punch managed to hit my face. And as silly as it sounds, I'm glad that I'M the one that got hit. There were SEVERAL children around me, and that woman could have easily hit one of them instead. People don't care and many of them have the mentality of "They shouldn't have brought them if they didn't want them to get hurt."
Leave her at home. I know a few people might suggest that if you bring her, leave her in one spot of the store and tell her not to move but if you're going to do that then why would you even bring her? Plus I'd be worried about her the whole time. With all of the craziness going on, do you know how easy it would be for someone to walk off with her?
It just doesn't seem worth it. Too much can go wrong.