Is this pure love, which motivates one to do good and supplicate for others, considered an acceptable love, or does it fall under the category of blameworthy ardent love? And should we stop supplicating for those we love if the love is a blameworthy ardent love?

There is no accountability for heartfelt emotions as long as they do not lead to action, for Allah Almighty says: "And there is no blame upon you for that in which you have erred, but [there is blame for] what your hearts have intended." And Allah has overlooked for the Ummah what they speak to themselves, as long as they do not utter it or act upon it.

You must be careful not to dwell on these feelings lest they lead to blameworthy infatuation, or cause you to fall into what Allah dislikes, for Satan lures [people] to that.

There is no harm in supplicating for her with good, like any Muslim, for supplicating for a brother in his absence necessitates for the Muslim the same as he supplicated for.

And if the girl is righteous and it is possible to marry her, then that is good, for the Prophet, peace and blessings be upon him, said: "Nothing is seen for two who love one another like marriage."