Our expert says:
Issues with step-children can be difficult to handle, and often the best way will be through your husband, unless you have a good relationship with their mother?
You don't mention what the psychologist thought was going on, but it would be worth revisiting what was said about her presentation. There is always the chance that she is just very different from her sister and often twins will try and be very different from each other because they get fed up of people seeing them as the same. You can also speak with her and ask her if there is anything that is making her unhappy. Many children also struggle with divorce so if this has been around recently this may also be contributing.
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