A few points that have been raised and why I don't think they're suspicious...
I've taken my three kids in the beer store before and responsible drinking by parents isn't unusual. Even if she was breastfeeding Lisa, having a reasonable amount of wine (a glass or two, from what I've read) was not harmful.
As a parent of young kids, sometimes there are days when you'll find any dumb ol' excuse to get out of the house sans kids and I don't think it's at all unusual she might have gone out with her brother for just a few items.
Even if she had tons of baby wipes at home, she may have seen a travel pack of wipes (they come in pouches for diaper bags) and decided to buy it while she was already at the store for the wine. When I still had kids in diapers I'd just throw a few wipes in a zipper bag but other moms buy small pouches for the diaper bag or to keep at Grandma's, babysitter's, etc. Ditto with the baby food -- maybe it was on sale or she was anticipating needing it in the near future. As a parent of LOs you do whatever you can to think ahead and avoid extra shopping trips.
A bit off-topic for this thread, but IMHO it's not unusual she put Lisa to bed in day clothes instead of jammies. As a mom of three who finally went down for the night, I can verify they are in comfortable clothes but I don't think all three made it into their jammies. If your baby falls asleep nursing it's not worth the battle to wake her just to change her into pajamas.
I personally think she gave her brother the change because she appears to be wearing sweatpants in the surveillance video and maybe they didn't have pockets. If she was carrying the box of wine in one hand and would be opening the car door with the other, she wouldn't want to juggle a handful of change as well.