we started potty training last week, and its going well, she seems really proud of herself. however, she seems to be 'holding in' poos, she wont push (!)then is getting constipated, and it is really sore when she does have to push. i have given her a little lactulose which shes had before for painful constipation, but dont want her to be too loose cos it will also distress her if she leaks. she has a good diet and drinks lots of water. how can i help her overcome her fear of pooing?!