If you sue someone that doesn't have any money, what happens?

Question Details:

I am suing my roommate for $900 that she never payed to our landlord like she was suppose to. It has been about a month sense the incident. If she has a job but does not have the 900 dollars and probably does not have 900 to her name would the judge not make her pay the judgement? Would it just be a waste of time to sue her?

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