Lactose intolerance is common in premature babies but like other babies with lactose intolerance they often grow out of it. If she has a problem with wheat she shouldn't have toast and biscuits (unless they are gluten free products). So I imagine the poor child grew out of her problems years ago and has been having a restricted diet for no good reason. Nurses don't get much training in allergies.
If you can gently suggest that the child may benefit from seeing a dietician they might put her straight.
If I were giving her laxatives, you'd hardly be suprised if she showed symptoms of an intolerance - i.e. tummy problems!
oh. well in that case she's clearly bonkers!
as if you'd be feeding the child laxatives

bizarre indeed
actually, i would ask her next time you see her about the lactulose. say you were looking it up to make sure you knew all about it so you didn't give her any inadvertantly but could only find stuff about laxatives... see what she says.
I was surprised about the lactulose thing too - but I asked her mum to write it down, and that's what she's written. She's a nurse too!
it's lactose, not lactulose, that's why you can't find anything

wheat thing is bizarre though, she can either eat it or she can't. if she was actually intolerant it would make no difference if it was bread or toast