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Als Grund gab die dreifache Mutter an, dass Mia manchmal so abweisend und beunruhigt von Besuchen beim Vater nach Hause komme.
What does von etwas beunruhigt mean in this context? Why 'Mia comes home dismissing and disturbed about her visiting her Dad.'?
In your sentence "beunruhigt" is an adjective to Mia. As you noted, it describes her as puzzled, troubled, worried, or discomposed. The sentence does not specify how in particular the visits make her puzzled. The sentence simply states that she sometimes returned in this state.
"Von etwas beunruhigt" means "troubled by something", but note that this phrase does not occur in your example! The "von" is the "from" in "return from visit".
Als Grund gab die dreifache Mutter an, dass Mia manchmal so abweisend und beunruhigt von Besuchen beim Vater nach Hause komme.
I don't see a von in connection with beunruhigt here. There is only nach Hause kommen von
Here's what leo says concerning the verb
beunruhigt - concerned
... and disturbed from visiting her dad.