Wow, the hot thread of the weekend...
I would have to know more about her personality in general and how she joined your group, but pretty much agree with Chaos Turtle and SeFRo. I think it was dishonest AND bad manners (and her reply confirms it), but if she's new and this has never come up with the older members, then it's a learning experience and a chance to clarify with the group what should be done (although if the group is split, then who knows how that will turn out).
I would have to know more about her personality in general and how she joined your group, but pretty much agree with Chaos Turtle and SeFRo. I think it was dishonest AND bad manners (and her reply confirms it), but if she's new and this has never come up with the older members, then it's a learning experience and a chance to clarify with the group what should be done (although if the group is split, then who knows how that will turn out).