My dad married Maddie's mom when I was 9. Maddie made it clear she hated me. She bullied me until I was old enough to tell her to F off. When I turned 13 she started being weird. If we were going somewhere and she knew what I was wearing she'd come out dressed in the same but more flashy? If I was wearing jean shorts she'd come out in bedazzled jean shorts. Sounds innocuous but after years it gets annoying. If I changed from shorts to a skirt she'd copy. Change shoes? She'd copy! Jewelry change? COPY! I told my mom and she said Maddie sounded threatened by me? Which made no sense cuz I was a baby faced 13 year old and she was old enough to drive.

This continues to present day. I'm 27 and she's in her 30s but she still tries to copy what I wear. Once I wore a reversible blouse to dinner with our parents and after going to the restroom in a black top I came out in a patterned one. She scowled the rest of the night. It's like she gets a thrill from wearing what I'm wearing but "better". I've talked to her about this and she always says I'm making it up or looking too deep into it or says I'm the one copying Her. It's infuriating but I try to ignore it. But I couldn't figure out how she was finding out what I was wearing places since we don't live together anymore (I live with our parents, she lives with her bf).

I recently found out she's been asking her mom what I'm going to be wearing in advance. Her mom doesn't think it's a big deal so tells Maddie what I'll have laid out. So when step mom would ask if thats what I'd be wearing I'd answer but I didn't know she was reporting back to Maddie. I stopped answering.

My bio grandma invited us all to a dinner at her house. Grandma's always been a very traditional woman. She expects us to come in our Sunday best. Maddie knows this. So when Maddie came to visit she ofc came to my room to talk. And she saw a red mini dress I had hung up. She asked what it was for and I jokingly said it was for grandma's dinner. She looked shocked and said it was a bold choice. I laughed and said yeah but I haven't been anywhere since the pandemic so I wanted to look hot. She just nodded and left after. I didn't think she actually believed me and forgot about it.

But the night of the dinner she showed up in a tiny red halter dress. She looked like she was heading to the clubs. I saw her and gaped. Grandma said she looked like a hussy (yes those exact words). Maddie said I wasn't dressed any better but then she actually saw me (in a modest knee length cream dress) and Jesus. She went BALLISTIC. Called me a liar and a snake. Step mom scolded me for tricking her. I said I didn't trick her but it wouldn't have happened if she wasn't hellbent on copying me. Dad was mad I 'started drama' and usually he takes my side because he knows how Maddie is.

AITA for accidentally misleading her?