HOW CAN YOU FIND A RUNAWAY DEBTOR (reposted with more details)

I AM REPOSTING THIS QUESTION WITH ADDITIONAL DETAILS THAT I FORGOT TO MENTION BEFORE.

I have a relative who's in need of money. Her name is Imelda. Imelda is applying for a Tourist Visa in London & she needed that money to deposit it to her Bank Account for her to pass the requirements of the British Embassy. She is actually my 2nd degree cousin & we just met here in Qatar. I was kinda short that time so i referred her to someone else bec. im still willing to help her.. Before I continue the story i just want you all to know that I really made a terrible mistake of trusting somebody & I already accept the fact that im sooo.. STUPID.. Thank you & please dont try to mention it again and again & try to stick to the question. But i only did it just to help someone in need. So we went to this woman whom i referred her to. I was a good payer to this woman & she wont even have second thoughts to lend me money once again. We took QR.5,000/- with 12% interest. WE SIGNED A FEW PAPERS SHOWING THAT I AM THE DEPTOR, & MY COUSIN IS THE GUARRANTOR. My cousin also issued a P.D. Cheque amounting to QR. 5000/- I GAVE ALL THE MONEY TO MY COUSIN. A few weeks later I found out that she's already in London without telling me. I TRIED CALLING HER, SMS, CHAT, E-MAIL BUT THERE WAS NO RESPONSE.. in short, she ran away & obviously not willing to pay her debts. I ALSO TRIED CALLING HER FRIENDS & RELATIVES BUT NOBODY KNOW WHERE SHE IS. She's been there for almost two months under tourist Visa. I saw her pictures on Facebook & she is really there. Last week I FOUND OUT THAT SHE’S BACK HERE IN QATAR. Her tourist Visa might have expired so she has to leave London. I tried to find her but there was no luck. I dont even know where she lives. I drop her once in her house in Dafna but couldn’t remember the exact location. I spend two nights roaming around Dafna. She actually came back on Jan. 10. SHE DIDN’T CAME BACK HERE TO WORK, SHE CAME BACK TO PROCESS HER WORKING VISA TO GO BACKT TO LONDON. I also found out that she got married to a Muslim Jordanian man last year & HOLDING HUSBAND VISA here in Qatar before she left. I am very sure that she is staying with her husband now. Her husband is working in City centre. I ALREADY APPROACH HIM BUT HE’S NOT WILLING TO GIVE ANY DETAILS ABOUT HER. HE SAID HE DOESN’T KNOW IF SHE IS HERE. Then I knew that he is protecting/hiding her so I stalked at him & tried to follow him along the road but i always lose him. He really drives fast. I made 3 attemps. I know she’s still here to process her working Visa. IN A FEW DAYS NOW, SHE WILL BE LEAVING QATAR ONCE AGAIN AND GO BACK TO LONDON. I am really trying to find her before that happens.

So please tell me.. how can i find her? For sure she's still here to process her papers to go back to London bec. there is a job waiting for her there. I CANT SUE HER SINCE I AM THE DEBTOR.