You are. Liver contains high levels of vitamin A which is too toxic for the foetus. Other no no-nos include :
Soft cheese like Brie , pate , uncooked eggs , unpasteurised milk , shellfish , soft boiled eggs , nuts , alcohol/drugs (for obvious reasons) , undercooked meat etc. She should always be vigilant in washing fruit and veg thoroughly to remove any soil traces which may be left as this could lead to toxoplasmosis which could pose a serious risk to the foetus. Hope this helps x