A neighbour asked me to look after her DC to attend a festive event (apparently child free) on a weekend. I said I have family and plans but my DM felt sorry for her and said I should just look after her. Fast forward, I have asked when she plans to come home so I can send her back for sleep etc. she's messaged to say very late and that she may be drunk if DC can sleep over. I messaged to say that I am not feeling well (which I am not, currently pregnant and not feeling good) and if she can arrange to come and collect her DC. She has an older DC who I imagine is sick of playing parent and is refusing to take her. I don't like to shame anyone but to think your priority is to party THE WHOLE DAY and leave your DC in the hands of a neighbour who is helping out of kindness is crazy to me.
I am not a confrontational person, how can I politely put her straight?