Whatever that means. It shows that she can be forgiving (if you want to get really analytical here), though what Dave has done - and more so who he even is - is anyone's guess at this point. It's seemingly something really bad to warrant him making it on to her itinerary, but he may have just given her a rubbish Christmas present or forgotten to take the bins out that morning. Either way, this is definitely the makings of an intriguing backstory that's just waiting to be developed further. It seems somewhat strange to include this if it's never going to be explored. At least she's got her Game of Thrones marathon to keep her busy in the meantime.