You are looking for Misadventures Incorporated. It features a young noble lady who escapes from her father after he orders her to kill herself. Her body is childlike at the start, but she atures physically and grows large knockers as time and puberty kick in.
She begins a little murder happy...
I have a self plug for you to check out. Seventeen Seconds to Eternity.
It crams all of the world building of my million word series into a 60k novella :)
In Misadventures Incorporated, the main character uses whatever happens to be on hand, including chairs, bones, candle holders, random animal parts, etc. It takes over a hundred and fifty chapters for her to finally settle on an iguana.
Bit late, but replying to the covers video.
I swear that there's no weird furry stuff. Except for when it's used as a joke. It's mostly just waifu bait.