All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If the marriage contract has been completed, then the husband would be obliged to bear the maintenance of his wife. Paying for her compulsory tickets to join him is also among the compulsory maintenance; so, he has to pay them.
However, if the marriage contract has not yet been completed, then the fiancé is not obliged to bear any expenses.
Therefore, the girl or her parents should pay for the tickets to bring her for her marriage.
Allah knows best.