The all-weather lifeboat, under coxswain Paddy McLaughlin and with six crew members onboard, launched at 11.30am and continued searching until 6pm yeserday evening.
The lifeboat started its search in the area of Ballintoy before moving south to Torr Head. Coastguard units meanwhile searched the shoreline.
Weather conditions were favourable with a cold but moderate sea and good visibility.
“We searched in good conditions for most of today but unfortunately we didn’t find anything,” said McLaughlin.
“Our thoughts remain with the lady’s family during an ongoing search.”
Elsewhere, the volunteer lifeboat crew at Larne RNLI responded to a launch request from the UK Coastguard yesterday morning.
The initial alarm was raised by a concerned member of the public who reported seeing a person signalling to shore from a fishing vessel around 1.5 nautical miles off Glenarm.
Larne RNLI’s all-weather lifeboat launched at 10.45am and quickly made its way to Glenarm. The lifeboat crew made radio contact with a fishing vessel in the area who confirmed they did not require any assistance.
The surrounding area was searched to ensure there were no other vessels nearby. The lifeboat was returned to Larne after it was established as a false alarm with good intent.
Speaking following the callout, Larne RNLI coxswain Frank Healy said: “We thank this vigilant member of the public who called the coastguard out of genuine concern.
“We would urge anyone who is concerned that someone is in distress along our coast to always ring 999 and ask for the coastguard. We would always rather launch to a false alarm with good intent than not launch at all.”
Larne RNLI will host its annual icebreaker swim at 12 noon on New Year’s Eve at Ballygally Beach.
The lifeboat station is asking people to 'Get freezin' for a reason' this New Year’s Eve, with all money raised going to the RNLI to help save lives at sea.
Anyone interested in taking part can obtain a sponsor form by contacting 07516 496945 or the station’s Facebook page, or collect on the day.
Hot refreshments will be available at the Ballygally community centre following the swim.