I wouldn't say anything to her. She has the right to have the tv on all day without people judging her, just as you have the right to have yours off without people judging you. My tv is on all day from 7am to 11pm unless we have music on. I grew up with 8 sibling, always noisey, something always going. Now I can't stand it too quite, it makes me jumpy and uncomfortable so i have the tv on for background noise. My kids don't just sit there all day watching it, they play and they play well. If someone told me I shouldn't have the tv on, I wouldn't have them back in my house cause I wouldn't want someone coming over if they are going to question my choices. I'm not saying my choice is right but its my choice. If you say something to her just beware that she may not react to well. I hope I haven't sounded to catty but just giving you a different point of view.