Ears are huge compared to the body size. But she definitely looks like every mini rex that I have had.
I actually had a woman sell me two "Mini Rexes" but they were 8 lbs. I saw the mom and she looked like a full rex and the dad looked like a full mini rex. I asked her about it and she said that they are indeed mini rex but when I asked the moms weight she said 9 lbs but I never said anything about it. Cause I knew that they were mini rex/rex mix. They weren't pedigreed but still, I knew they weren't full mini rex. Sometimes people make mistakes and maybe the mom or dad could have been mini and the person she bought it from made a mistake on the pedigree. Unless the other siblings are normal size, because at a year old they should be full-grown, she may just be a genetic mishap and ended up smaller. Have you seen mom and dad and asked their weight?
Also,
@SableSteel if OP entered as mini would ears be a DQ or fault as it looks too long for the limit of mini rex ears?