People are posting what they are about Lauren because she has an admitted history of lying to become famous. It is therefore not a wild leap to suggest she might not being entirely honest about her condition.
Feenie if you don't understand that everyone on BB will have their every move questioned and judged then you must be quite naive. People can post that they have their doubts if someone is telling the truth.
Other people on BB I don't think are telling the truth are Courtney (I don't believe she married for love) and Charlotte (I don't believe she wet the bed by accident).