She has provided the company with many years of 'loyal' service.
She has remained/stayed 'loyal to' her old friends.
has served 'loyally' for many years
(..) Who sent word to Essos to murder Daenerys Targaryen? - Your Grace, I did what had to be done to... - To keep yourself alive. Lord Varys has proven himself a loyal servant. Proven himself loyal? Quite the opposite. If he dislikes one monarch, he conspires to crown the next one. (..)2017 TvShow: Game of Thrones Title: Stormborn Season: 7 Episode 2