It leaves it open to interpretation, doesn't it? The hope being that people will interpret it as Jack having a hand in it now being open on Monday. It's subtle but, she's sneaky.
Burgers... No shame in sampling a variety of burgers, whenever the fancy takes you. What I will judge her for, is swiftly making a burger a permanent fixture, declaring them the best ever, before moving swiftly on to burgers new as though nothing has happened. If she didn't have a child, then fair enough, do as you please. But she does have a child to consider, so I will raise a judgemental eyebrow with no apologies.