Lindsay Lohan’s assistant has revealed that the Mean Girls star is doing good at the rehab centre.The Mean Girls star is currently spending her court-ordered 90 days in rehab at UCLA Medical Centre."Lindsay is doing great," UsMagazine.com quoted her assistant, Eleonore, as telling RadarOnline.com.Eleonore also downplays a report that she is "miserable" working with Lindsay's mom, Dina, and 16-year-old sister, Ali."I love Dina and Ali and Lindsay with all my heart," added Eleonore.