She was last seen at Dewsbury District Hospital just around ten past midnight on Wednesday January 18.
She is described as white, with long red hair, and was last seen wearing a white coloured top, black coat and skinny leggings.
Kasie is known to have contacts in the Birstall and Batley areas of Kirklees, and police are appealing to anyone who has seen or heard from Kasie, or who knows where she is now to get in contact.
Detective Inspector Walker of Kirklees CID said; “We are very concerned for Kasie’s welfare and consider her to be vulnerable, I would appeal to anyone who has seen her, heard from her or knows where she is now to urgently get in contact. Enquiries are ongoing.”
Information should be passed to police via 101 with the reference 012 of January 18.