ORLANDO, Fla. -- A national group joined the search Wednesday for a missing Orlando woman who mysteriously vanished more than a week ago, according to Local 6 News.

Members of Child Watch of North America said they plan to bring more people and more structure to the search for 24-year-old Jennifer Kesse.

The Child Watch group normally focuses on missing children but felt compelled to offer their expertise to the search.

Kesse was reported missing last Tuesday after she did not show up for work at the Westgate Resorts in Ocoee, Fla.

The group immediately planned a large search for Saturday and asked the public to get involved.

"We will register you and put you into teams," Child Watch spokesman Don Wood said. "We have coordinators who will work and coordinate search efforts and take you out into the field. Two hours is all we really ask."

Volunteers are asked to sign up at the Mall at Millenia from 10 a.m. to 6 p.m. Members will be photographed, given a badge and put into a search party. Registration will be held at the community room near the Banana Republic store at the mall.

Meanwhile, officers on horseback continued a grid search of some wooded areas.

Teams of police officers and sheriff's deputies searched areas inside the boundaries of Texas Avenue to the west, Orange Blossom Trail to the east, Oakridge Road to the south and Holden Avenue to the north.

It was the fourth day officers have searched on horseback.

Nearly 100 anonymous Crimeline tips have been made since last week, but the woman remains missing.

The first break in the case came Thursday when Kesse's 2004 Chevrolet Malibu was found abandoned at the corner of Texas and Americana at the Huntington on the Green apartment complex. Neighbors said the vehicle had been parked in the lot for several days.

After Kesse's vehicle was found, officers performed a grid search of a wooded area near the Mosaic at Millenia condominiums, but nothing was found in the area.

A $115,000 reward is being offered for information about Kesse's whereabouts.

If you have any information, you are urged to call Crimeline at (800) 423-TIPS.

Watch Local 6 News for more on this story.