how can i track down a person who owes me money?

how can i track down a person who owes me money?

so the girl that i thought was sweet, just not a very good roommate (late rent, didn't pay her bills, extremely messy) has actually turned out to screw me over real good. to the tune of $900. this roommate had, while living here, been dropping her rent off at the management office in person because she couldn't pay it on the first. what must have happened was that when i asked her to move out (with two month's notice, cause i as trying to be considerate) was that she simply stopped paying her rent...and then stole the rent statement notices when they came in the mail so we wouldn't find out that there was a balance. we had just returned her security deposit when we found out. what do i do? my other former roommate and i have been trying to contact her (by phone and email) for about three weeks. i found her parents' address (in another state) and sent them a registered letter, explaining the situation and asking them to help me locate her before i had to take legal action. the letter was delivered a week ago and i have yet to hear from them. i need to take her to court and get my money back. there is no other option. i can barely pay my own bills, let alone this. all i need is her new address. how can i find her?? and no, i don't know anyone who is in contact with her.
Succulent questions.

Succulent questions.

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pillows.

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Fuzzy little plant

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shrub ID requested