...Danielle's neighbour was worried.
(Here 'worried' is an adjective, so neither past simple nor the passive voice - because it would have to be used as a verb for those to be the case).
Past simple: The thought of walking home alone in the dark worried her.
We don't often use 'worry' in the passive.
Passive form: object plus 'be' plus past participle
ACTIVE: The police arrested him.
PASSIVE: He was arrested by the police.