With no viable explanation, lying has become to new norm and we are perplexed

For perspective, SD is almost 7, diagnosed with ADHDWhen I first met my now fiancée and her daughter, we used to joke to ourselves about how SD was bad at being a kid because she never lied. It was once in the bluest of moons that she would lie, and then before you could question her, she would admit it’s a lie, tell you the truth, and apologize. Not a bad trait to have for a kid right?Fast forward to the past couple weeks and it’s ridiculous. She has a rotating schedule with father, BD, and he is notorious for not giving her a bath or brushing her hair. So is common for us to question her about it when she comes back home about if she’s had one and what not. Last week, dad had her for five days and when she got home, we asked if she had a bath. She says no. We can clearly see that her hair was recently brushed, so we weren’t sure. She kept saying she hadn’t. I told her to tell the truth because we would call dad and ask him. She still said she hadn’t. So we called BD and he said she had one the second night because she was playing outside and then had another one shortly before he brought her back to us because she had gotten food all in her hair during lunch. Maybe BD is lying? We let it go.The other night, I told her to clean up the bottles in the upstairs family room. She is notorious from grabbing a drink (sparkling water or whatever), finishing half, putting it down and then getting another one because she walked away from it. I told her to clean them up because one: I’m sick of constantly finding them everywhere and two: because she keeps saying they’re not hers, fiancée is now thinking they’re mine. When SD was told to clean them up, she refused because they weren’t hers. She claims mommy did and mommy should clean them up. Then when her mother called her out on the lie, she proceeded to blame me, who was at work all day, so clearly I’m not the culprit.Just this morning, fiancée was was measuring her height on the door jamb and when she walked away to put the tape measure back, she sees SD smearing the fresh pencil mark. When fiancée got upset and questioned her about it, she blatantly stood there and told her that she didn’t do it, it wasn’t her.All of this is partnered with her accusing EVERYBODY of lying when she’s told something that she doesn’t believe or corrected on something. If she doesn’t believe that you have to be sixteen to get your license, you’re lying. She doesn’t think something is real, you’re lying. She doesn’t remember you telling her something or her doing something, you’re lyingAnd that’s what these all have in common. She claims “she doesn’t remember”. Now if I question her on what she had for lunch last week with grandma and she doesn’t remember, fine. But you can’t stand there, caught in the act of doing something, and then claim “I didn’t do it because I don’t remember”All of this has come out of nowhere over the last few weeks and we don’t know how to proceed because we suddenly can’t trust anything she says. There’s lies every day, about little stuff, constantly. I don’t know if she’s learned she can get away with this somewhere or what’s going on, but it needs to be curbed pronto because it’s become ridiculous.How do we get her to understand she can’t lie? And get her to start being honest with us again? via /r/Parenting https://ift.tt/2MfUCpy