Why would King Solomon refer to wisdom as she and her?

Solomon had experience with a lot of wives/concubines and had a great understanding as well as being taught on how they are. Wisdom is a marriage in which one engages, you court it by asking for it. Then you marry into the relationship never to leave it. Much like a marriage it improves you, you learn things, more patient and understanding. Wisdom is the 'love' you've wanted and now have, so take care of it as will take care of you.