Is it permissible for a Christian woman to marry herself without a guardian (wali), and is the marriage valid if her mahr (dower) was a rose given to her on the wedding day and on the anniversary of the marriage every year, knowing that the marriage was Islamic, conducted in the presence of an imam and two just witnesses, and that she agreed to appoint one of the Muslim brothers as her representative?

The preponderant opinion is that there is no minimum limit for the mahr (dowry), but it must be something of benefit. Therefore, if a rose is something of benefit, it is valid for it to be a mahr.

As for the condition of bringing it every year on the same wedding date, there is a concern that it might involve imitation of disbelievers. The Prophet (peace be upon him) said: "Whoever imitates a people is one of them." Thus, this condition does not need to be fulfilled.

As for her attendance with the Imam, there is no harm in it if she is veiled.

The major problem is her marriage without the permission of her Christian guardian. This is invalid according to the majority of scholars, based on the Prophet's (peace be upon him) saying: "Any woman who marries without the permission of her guardian, her marriage is invalid."

Therefore, the contract must be renewed with the permission of her guardian, and she should be invited to Islam.