who has since turned 18

[Xianyu]

Berlusconi says he helped Ruby, whose real name is reported by Italian newspapers to be Karima El Mahroug, but he denies exerting any improper pressure on police officers. The teenager, who has since turned 18, has told newspapers she received 7,000 euros ($9,760) from Berlusconi after attending two parties. She has denied having sex with him.

Hi, everybody!
Does the part in red mean 'the teenager is going to be 18, but now she is still 17'? After looking up in dictionaries, I fail to find what the 'since' exactly means here?

Thanks!

[Thredder]

The teenager was 17 at the time of the incident, but at the time of writing she is 18.

She has turned 18 since the incident happened.

Does this help?

[Xianyu]