The victim was targeted by an unknown man as she left an apartment complex in Blonk Street yesterday at around 5.50pm.
The man is described as being in his early 30s, Asian, of medium build and was wearing blue jeans and a t-shirt.
South Yorkshire Police are reviewing CCTV footage from the area.
Detective Inspector Mark Monteiro said: “The woman continues to be supported by specialist officers and I would like to ask anyone who was in the area at the time and who may have seen anyone acting suspiciously or matching the description to contact us.”
Anyone with information is asked to call police on 101, quoting log 909 of July 30 2016, or Crimestoppers anonymously on 0800 555111.
You can also email information to [email protected]