I agree, she does not look like a black Australorp, but unsure of what she is. Her chick photo DOES look like Australorp. Maybe she will fill out as she gets older.

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I though sumatra as well, but I think that they have longer tails than OP's bird, and tend to carry their tails lower than OP's bird as well. I'm stumped!I think I found it... a black Sumatra, I found the pictures on the internet.View attachment 2312555
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And this is what all my previous Australorp were like!This is my supposedly black australorp and her eggs are the very dark brown.
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Black samutra dont have much red in the faceI think I found it... a black Sumatra, I found the pictures on the internet.View attachment 2312555
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Cream eggs??Hatchery is what hatchery does. Looks like an Australorp to me. Hatchery quality.
This breed is very similar to the Ayam Cemani. HmmmmView attachment 2312550
These look a bit like what you have (not my pic) I've never heard of them before though. They're called kadaknaths. I don't see them on any hatcheries though. It's very unlikely that you'd get rare breeds at a farm store... I'm stumped!