how has beatrice changed in this scene from her prvious behavior in scene iv of act iii

Although Beatrice is still witty, there is a more negative tone to her quips about men and marriage. Consider when she implies to Hero, who is soon to be married, that marriage is essentially a trade of money for sex.

Ye light o' love, with your heels! Then, if your husband
have stables enough, you’ll see he shall lack no barns. Act 3 sc 4