Błędnie: Her salutary life, with no friends, no family, must have been very happy though. She simply didn't need other people. Poprawnie: Her salutary life, with no friends, no family, must have been very happy though. She simply didn't need other people.
"Salutary" oznacza 'pożyteczny', 'zbawienny'; "solitary" to 'samotny', 'samotniczy'.