Why was Isabella eager to see Columbus upon his return to Spain after his fourth voyage?

Isabella was eager to see Columbus upon his return to Spain after his fourth voyage because she wanted to hear firsthand about his discoveries and the progress of the New World exploration. Additionally, Columbus had faced significant challenges during his last voyage, and Isabella was concerned about the welfare of the colonies and the potential for further expansion. Her interest was also driven by the desire to solidify Spain's status as a leading power in exploration and trade.