Sentence fragments have nothing to do with understood or non-understood meanings. A fragment is a clause that cannot stand alone
grammatically (not semantically) because it is missing a subject, missing a predicate, or contains some linking word but isn't linked to something.
These are sentence fragments:
Lived in there for years before she passed away.
Before she passed away.
She lived in there for.
...and so on. But
Quote:She lived in there for years before she passed away.
is not a fragment: it has a subject, it has a predicate, and it does not contain a floating linking word. It is true that the exact meaning of the word "there" is ambiguous, but that doesn't make the sentence a fragment; it just makes the sentence's meaning ambiguous. It is still a complete sentence.