The Federal Bureau of Investigation is in day three of its search for Alexis Murphy and there's still no sign of her.

The 17-year-old was last seen leaving her home in Shipman on Saturday. She told family members she was going shopping in Lynchburg, but she never made it home.

Investigators are using all resources at this point, including helicopters and K-9 units.

Nelson County Sheriff David Brooks says they're trying to cover as much ground as possible.

"We're starting to extend the search 30 miles outside of Lovingston, north and south of 29," said Brooks. "We have 50 plus FBI agents in the field, along with state police."

Alexis Murphy's family and friends are trying to get her face out there as much as possible.

You can't travel too far in Nelson County without seeing a flyer with Murphy's face on it.

Family and friends have been trying to get the word out all day. They say the public is the greatest tool they have at this point in the investigation.

"We just need her home," said Trina Murphy, who is Alexis' aunt.

It's a plea for help that no family ever wants to make.

"I know that there's somebody out there who knows something, seen something that they may think is insignificant, but right now, there's no insignificant detail."

It's been 72 hours since Murphy's family saw her leave the house in Shipman.

"The longer it goes, the more difficult it becomes for us, but we're a strong family and are depending on each other and we know God is watching over her and us and that's the only thing we can fall back on right now," she said.

According to investigators, there's been no sight of Murphy since she left home, but her presence is all around.

Signs and flyers are now popping up in storefront windows all around Nelson County. Family and friends hope it will lead to a break in the case.

"We just want to cast as wide of a net as possible because the more people that are looking the better chance we have of finding her," she said.

The clock is ticking, but Murphy's family is optimistic that something, or someone, will come forward sooner than later.

"I'm hoping we're not going into the next few days," said Murphy. "I'm hoping that she's going to come home and the next few days will be spent celebrating."

FBI agents are not releasing many details at this point.

Murphy's aunt says Alexis is getting ready to head into her senior year at Nelson County High as a standout volleyball player. School starts on Monday and they're staying positive that investigators will find her alive.

If you know anything, you are asked to call the Nelson County Sheriff's Office.