I’ve just looked up the latest UAE regulations on this, according to gov.uk:
"Sexual relationships outside marriage
Consensual sexual relationships between a man and woman outside marriage are generally legal if both are aged 18 or over. This includes extra-marital sexual relationships. However, if either person’s spouse or parent/guardian files a criminal complaint, both parties of an extra-marital consensual relationship can get a prison sentence of 6 months or longer.
If a person aged 18 or over has a sexual relationship with a person aged 17 or under, they will be prosecuted for having a sexual relationship with a minor. If both people are aged 17 or under, they will both be prosecuted but punishment is likely to be limited to a caution, parental supervision, judicial supervision, professional training or psychiatric treatment."
So it seems likely that in this case, which I think took place after the new laws were introduced, the underage girl involved would not have been prosecuted if it had been reported whilst she was still in Dubai.
I hadn’t realised how much things had changed in Dubai since I lived there, it’s quite a surprise.