Mika was last seen by her family in the early hours of Wednesday 29 April and was wearing white trainers, grey tracksuit bottoms, a pink t-shirt and grey fleece and carrying a black handbag.
She is described as white, with a medium build. She has blonde hair and blue eyes.
She is Polish-born and speaks both English and Polish.
Officers have been carrying out enquiries in Northbourne and conducting a series of searches of the nearby area.
Investigating officer Detective Inspector Richard Vickery said: "It is important we speak to Mika to find out if she is ok. She has left behind her family and we understand it is out of character for her to go missing.
"It is believed she may have links to Ramsgate and officers are asking anyone who might see her or have had any contact with her since 29 April to get in touch."
Anyone with information is asked to contact Kent Police on 101 quoting 30-0243.
