(NewsNation) — The family of missing blind solo traveler Carla Valpeoz believes her case can be solved, but they are frustrated by a lack of action from officials.

Valpeoz disappeared in 2018 while on a trip to Peru. Her brother, Carlos Valpeoz, says neither the governments of Peru nor the U.S. have done enough to help find his sister.

“[She was a] taxpaying American citizen who dedicated her life to service, a true American patriot,” he said. “The U.S. government should stand by her.”

Following brain surgery in childhood, Carla Valpeoz could only see shadows. That didn’t stop her from traveling the globe and using her YouTube to inspire others and show that being blind didn’t make her less capable.

Carlos Valpeoz said that she always kept in touch with the family while she was traveling, but in Peru, she had some issues with her phone. Still, when she stopped communicating, they knew something was wrong.

He told NewsNation the family is frustrated by the lack of action by authorities both in Peru and the U.S.

“Most cases involve retrieval of cellphone data,” Valpeoz said. “Six 1/2 years later, and they still don’t have the basic data from her phone.”

That’s critical because it could pinpoint the last time she was seen.

The family knows that Carla Valpeoz went to Machu Picchu, where she befriended a group of travelers. She went with them on a hike to the top of Huayna Picchu, then celebrated afterward with dinner. Surveillance video also showed her leaving a hostel.

Frustrated with inaction from authorities, the family traveled to Peru themselves to retrace her steps and interview witnesses, turning up a ticket logbook and surveillance footage in Pisac, Peru.

What happened after that is a mystery.

Carlos Valpeoz said Peru hasn’t been aggressive in investigating for fear it would harm tourism and claims the family has been the victim of extortion attempts with the Peruvian government asking for money.

They believe the government has hidden and deleted sensitive information relating to the case.

But Valpeoz said the U.S. government hasn’t been much help either.

“Our family has had to be responsible for a lot of the communication; otherwise, these cases will get forgotten,” he said. “I’m on the phone every two weeks with them.”

Ideally, the family would like the two governments to communicate directly to push the direction forward.

In the meantime, they’ve continued their own work over the years, trying to make up for the lack of official information.

“Nothing has changed since the info we got in the first week,” Valpeoz said.