What did Lord Capulet do to try and stop Juliet thinking about her cousin's death?

He didn't really try to control her, per se. He was much more lenient than Lady Capulet, and most fathers in the 16th century. He wanted her to wait until she was sixteen to marry, and she also wanted Juliet to truly fall in love...but to "pick in the scope" meaning, preferably a man he'd approve of, a rich man who'd be sure to support her and the family, for example. Certaintly not someone like Romeo, who was a Montague, in the feuding family.