I read in one of the reports earlier this week that she had refused to attend court and that they had also made a video link available to her that she had also refused to attend. I don't know whether it makes any difference but on the early court appearances she had sat next to Mark Gordon and, it was commented in press reports, that she had chatted/giggled with him. But from last week, when the full trial started, a prison officer was placed between them on the first day. So I don't know if not being able to speak to him contributed to her refusal to attend.
If the defence calls her to give evidence in her own defence she can be cross examined by the Prosecution. The Defence argument, from opening statements, is that baby Victoria died from unknown causes and that she was not neglected at all by the defendants - on the contrary she was warm, well fed and dry. The prosecution is currently using 3rd party evidence to demonstrate neglect.