Whoa, that’s so exhausting. Like, two-faced much?? If she’s treating u different when ur dad’s not around, that’s honestly so shady. Some ppl just have this need to control others or feel superior by putting them down, idk, maybe it’s a her problem more than a u problem, y’know? But still, doesn’t make it hurt less. Maybe start keeping track of specific things she says/does? Not to make it worse but just so u have some examples if u ever wanna talk to ur dad about it or set boundaries w her…ugh, I hate that u have to deal w this.