Lina entered the entertainment industry as Mediacorp artiste after finishing 1st runner-up in the local talent-search competition Star Search 1993, was well known as a host in popular variety program City Beat. She later joined SPH MediaWorks, and left the industry following the merger with MediaCorp. Since leaving, Lina has made a number of cameos, most recently in the 2012 anniversary drama Joys of Life.
Ng was nominated for Top 10 Most Popular Female Artistes from 1995 to 1998.
In 2017, Lina played supporting role in a drama called Have A Little Faith where she played an abusive mother to Rui En. Shortly, she played another supporting role in another drama called My Teacher Is a Thug as Bonnie Loo's mother. She went to participate in a Channel 5 production called Lion Mums 2.
In 2018, she is involved in a toggle original drama series Close Your Eyes with casts like Edwin Goh.
In 2020, Lina reached the peal of her acting by taking home Best Supporting Actress for Mediacorp’s M18-drama Last Madame at the Asian Academy Creative Awards.