Two men have stolen cash from a 90-year-old woman after breaking into her home on the NSW central coast, police say.

The men confronted the woman after cutting a screen and forcing their way into her mobile home on Karalta Road, Erina, about 7pm yesterday, police said.

The men allegedly stole her handbag, which had a small amount of cash in it, and ran away.

Police are searching for the two men, described as aged between 16 and 20, both tall and of Caucasian appearance.

One was wearing dark clothing and a beanie and the other was wearing a light brown top and white shorts.

Meanwhile, police on NSW's south coast say they have charged a 37-year-old woman after she allegedly robbed two elderly people in Warilla in separate incidents.

On March 23, a 64-year-old man was walking near the intersection of George Street and Shellharbour Road when the woman pushed him to the ground and stole his wallet, police said.

On Sunday morning, a 70-year-old woman was walking on Hall Lane when the woman allegedly grabbed her handbag, pushed her to the ground, took a wallet from the bag and ran away.

A man chased and caught her and returned the wallet to the victim, who suffered cuts and scratches, police said.

The woman was arrested at a house in Warilla last night and she was charged with robbery, larceny and breach of bail.