Diana did not know Jane all that well, beyond that she was Jessica's friend, and so held her jointly responsible for Jessica's antics around the ship. In all truth Diana was rather hash with Jane and Jane in turn was mildly afraid of Diana who's bossy nature easily startled her. After turning Diana and Jane had to partner up on occasion, with both of them finding the arrangement difficult as their loud and docile personalities would often clash with Diana seeing Jane as inactive and Jane seeing Diana as a bully.
However after a run in with Order of St. Arthur the two were cut off and forced to work together, Diana witnessing Jane's inner strength and Diana giving her free rain after she said the reason she pushed her was to get her opinions. The two now share a friendly rivalry that is quite competitive.