Hi and Welcome, Irene,
Just done a quick check on my Sibley Monroe World List, and found 5 possibilities.
There are three Goldenthroats:
White-tailed Goldenthroat
Polytmus guainumbi, Tepui Goldenthroat
Polytmus milleri and Green-tailed Goldenthroat
Polytmus theresiae
If it's none of these, then there is also a
Glow-throated Hummingbird Selasphorus ardens although that doesn't have a golden throat, and a
Fiery-throated Hummingbird Panterpe insignis which only sort of sort of does from the only picture I could find.
I'm afraid this is purely table checking research and a bit of googling, so I have no idea if any of these can be found in the location you friend described.