Glossary entry (derived from question below)
English term or phrase:
be a rock
Portuguese translation:
mostrar-se firme como uma rocha; ser uma verdadeira fortaleza; estar firme como um rochedo; ser muito forte
English term
United States
BA in Transl., MA in ESL, 15 yrs of exp.
Native in: Portuguese 
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese, and 2 more.
Ava was a rock.
"Over the days that followed, Ava was a rock. Throughout the futile search for my father’s body, the eventual abandonment of that search, and the funeral, she stood by me."
Dec 8, 2017 17:25: changed "Kudoz queue" from "In queue" to "Public"
Dec 9, 2017 01:23: Mario Freitas changed "Level" from "PRO" to "Non-PRO"
Non-PRO (3): Bruna Reis, Patricia Franco, Mario Freitas
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Proposed translations
Portugal
Maria Teresa Borges de Almeida 
30+ years translating EU documents
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, French to Portuguese, Spanish to Portuguese, and 1 more.
Ava mostrou-se firme como uma rocha
| agree |
Thayna Moreira
5 mins
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Obrigada, Thayna!
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| agree |
Ana Vozone
36 mins
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Obrigada, Ana!
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Ava foi muito forte
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Note added at 11 mins (2017-12-08 17:36:43 GMT)
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diz uma canção:"Mas é preciso ter força
É preciso ter raça
É preciso ter gana sempre
Quem traz no corpo a marca
Maria, Maria
Mistura a dor e a alegria..." (Mílton Nascimento_)
Ava não vacilou
| agree |
Anne Savaris
: Gostei da sua sugestão, Leonor. Uma parecida seria também: Ava se manteve firme.
15 hrs
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Obg Anne!
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Will do!
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
(esteve)/(comportou-se)/(teve uma postura) firme como um rochedo
Em alternativa, "foi como um pilar para mim".
https://www.google.pt/search?q="foi um pilar para mim"&oq="f...
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Note added at 54 mins (2017-12-08 18:19:31 GMT)
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https://www.google.pt/search?q="firme como um rochedo"&oq="f...
Brazil
German, English, Spanish to Portuguese!
Native in: German (Variant: Germany) 
, Portuguese (Variant: Brazilian)
Works in: German to Portuguese, English to Portuguese, English to German, and 2 more.
Ava foi uma verdadeira fortaleza
Também optaria pelo pretérito perfeito, já que a ação foi concluída no passado.
Discussion