Catherine Shaw, from Witney in Oxfordshire, was last seen on 4 March in the town of San Pedro where the was staying with a friend.
Ms Shaw had been travelling in the central American country for two weeks with a friend.
Formal identification has not taken place but Ms Shaw's family have been informed.
The charity, which provides support to families with a relative missing, murdered or in crisis overseas, said in a statement: "The Lucie Blackman Trust is saddened to announce that a body has been found in the search for Catherine Shaw".
It has also been confirmed that she did not have a tattoo on her ribs.
CCTV footage reportedly captured her last known movements as she left her hotel carrying a musical instrument last Tuesday at 1.37am local time.
Jacket belonging to missing backpacker Catherine Shaw found in Guatemala
"We are utilising drone technology and expert mapping technology to pin point the location that Catherine's puppy was seen to better try and find her", the post said.
A puppy which Ms Shaw took with her when she left the accommodation was found at the peak of the hiking trail on Friday morning.
The search encountered many challenges including communication issues due to lack of power in the area.
Her friend, Jess Elizabeth, told The Tab: "She's a attractive soul, loves nature, outdoors, looking after the planet, interested in permaculture, yoga, travelling".
Her father, who has travelled to Guatemala to join the search, also issued a heartbreaking statement, saying: "Your friends, your family are all really anxious about you". "Please come home, sweetheart".
He added: "We urge anyone who may have any information, no matter how small, to get in touch as soon as they can".
The trust had received many sightings of female travellers matching Ms Shaw's description and had to work through several leads.
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