The botXXXXX XXXXXne is that the children can't enter a bar that doesn't serve "meals," or that does not have an area where liquour is not sold and which permits some social function.
For example, using your facts, if the bar has a pool table area and a person can order drinks from a barmaid in that area, then the children cannot be in that area, because liquour is sold therein. Similarly, if there are no "meals" served by the bar, then, the children cannot be in the bar at all, unless there is some area where neither meals nor liquour is sold -- but, that wouldn't be a bar, now would it?
I understand your concern, but be careful, because the laws are intended to operate against the establishment -- not, a custodial parent. The point being that it is not necessarily true that the parent is disserving the child(ren)'s best interests by having them in a bar where the establishment is prohibited from having the children.
If I were the judge, I wouldn't be real excited by what mom is doing, but I'd need more facts, before I would start thinking about making a parenting order change, based solely on the facts and circumstances you describe.
Hope this helps.