A friend of mine is moving overseas for 2 years on Monday. She is following her DH due to his job relocation. She's not thrilled about it because she has had to give up her job, but the money was too good to turn down. Her DH has already gone a couple of weeks back and she has been organising getting things shipped out and the house ready for rental. Since yesterday she has been staying with us with her 5 year old son. I was happy to help her out.
Yesterday I picked up her son (7) from school before getting my own 7 year old from her school. My friend was supervising cleaners etc in her house. He son is not really one for boundaries e.g. he just opens cupboards in our house and helps himself to biscuits. Anyway, my friend came back at 6.30, DH also came home a bit early and I made lasagne for everyone (we have 3 DC). Apparently her son only eats pesto pasta so I made that for him. Then he was refusing to sit at the table and wanted to eat in the living room to watch TV. My friend said (loudly), "No you can't eat in the living room at Downton Abbey." 
Anyway, I let it go but then she let him run off upstairs and not eat anything. DH was but said nothing. I found it very rude tbh. Then she was drinking wine while I was clearing up. If it was the other way round, I would have helped. At 9pm she asked if her son could could have toast.
There were shenanigans in the night because her son was up at 4.30, downstairs with the TV on. I get that he might be unsettled by the move. I took him back bed (sharing with my DS who is 9), but he got up again so I left him to it. This morning he appeared to have eaten most of a box of Cherrios (dry) and made a mess in the sofa. My kids are not allowed to eat in the living room.
I made a cooked breakfast for everyone which we ate while her son was in the back garden, kicking bushes. DH was not looking massively impressed but said nothing. At about 10am, my friend left to go and finish off at her house. As she was leaving she said this to her son - "Be good today because you're going to the museum with Don Draper" (DH has offered to take the kids to the Science Museum). I asked her what she meant and she said I really should watch Netflix (she always takes the piss that I don't know who is who on TV). So I googled this name and it's a character from a show about an office and who has serial affairs with all the women in the office! What the hell does she mean by that?
I feel like she lets her son run riot and she is taking the piss out of me in my own home. I'm doing dinner for mutual friends tonight as a kind of "farewell", but I kind of feel as if I'm fuming. AIBU or should I just let it go as she's at a tricky time with the move?