I find myself standing in front of my wardrobe, staring for the hundredth time at a rack of pretty clothes, the perfect wardrobe for the manager of a small but cutting-edge art gallery. Nothing in it says “nanny.” God, even the word makes me want to gag. I put on jeans and a T-shirt, scrape my hair back. I don’t even bother putting on any makeup. There’s no point, is there, prettying myself up to spend all day with a baby?
Could you tell me what is the exact meaning of the phrase "is there" which is inserted into the last sentence in the extract above?