An investigation by OKHotshot has reported that Sierra rug pulled the NFT project, using project funds to wash trade her own NFTs before cashing out. In total, she withdrew 120 ETH (at the time worth around $316,000; today worth around $151,000). Throughout, Sierra claimed that "absolutely none of the funding has been taken by founders".
In addition to the allegations around her NFT project, OKHotshot identified other shady behavior by Sierra, such as pumping-and-dumping other NFTs she'd purchased, and placing lowball offers in $DAI on big-ticket NFTs, hoping that their owners would mistake them for ETH.
After OKHotshot published the thread, Sierra blocked them on Twitter, and deleted the NFT project's Twitter account and website.