The victim was in Martindale Road, Hounslow, when two men approached her and stole her bag containing personal possessions, sparking an appeal by police.
The incident happened on Friday September 8 in the early hours at around 2.35am, police said.
A witness appeal has been launched by Hounslow Police following the incident.
Hounslow Police said: "We are appealing for any witnesses who may have seen a robbery in Martindale Road, Hounslow.
"The offence occurred on Friday September 8 2017 at approx 2.35am, where a female was robbed of her handbag."
Police said there were two suspects involved in the incident.
One has been described as a white male with short black hair.
A second suspect was described as a male wearing a black hooded top and had a black mask which covered his mouth and nose.
Anyone who may have witnessed the incident or has any information on who these suspects are, is urged to call Hounslow Police on 0208 247 6219 or via 101.
Alternatively if you wish to remain anonymous call Crimestoppers on 0800 555 111.
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