If she says something funny at home, laugh at it. But why are you watching TV with her? Get out and GAL.Be busy busy busy. In your interactions with her be upbeat, happy, fulfilled. Do not let her words or actions affect you emotionally. That is what detachment is.
Have you read DR?
Because we are spending time with our daughter and the TV happens to be on. I just threw the TV out there as an example. I can't recall the last time we actually watched something together that wasn't some kid show, outside of maybe a few minutes of the news. There really isn't a lot of interaction between us, even at home. I get out and get more busy after they go to bed (usually - rarer occasions I'll meet a friend earlier, and church is in the mornings).