Is どうなってる itself a phrase meaning 'how is it?' or a combination of several meanings? Such as どう, なる and ている.
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It is a single phrase, consisting of the three words you found. But it's still a whole phrase with many different ways to make use of.
Here are some examples.
You meet a friend and he acts totally weird. Then you would think:
Or you think of your sister, who has moved to Canada and you didn't hear from her for quite some time. You start worrying.