What to do?? How to deal with this

so i'm 20 my mother is 45 my nan has just past this xmas just gone now. on times my mother will go out to the local and have a drink. well its most weekends but hay thats better than some right. she dose work fulltime so she likes to enjoy the weekend witch is fair. but tonight it is now 03:55 and there is westlife blasting down stairs knowing my mother is going though a tuff time i didn't go down guns blazing and turn the music off. but i did go down with head phones. to find her eyes shut dancing in the middle of the kitchen to her self. i plugged in the head phones and my mother berst in to tears crying saying. "i was dancing with my mum and u fucked it all up for me she is gone because you stoped the music" even while writing this i can hear her cry. what the hell can i do or say to that !!!! this happens every so often not every week but close do i be harsh and say the truth that its late and it wouldn't kill her to turn it down or listen though headphones or just humor it all and put up with it ??? thought i would have my rant here face book is not the place for this type of thing.