I deleted my earlier blog mayankteria.wordpress wherein Readolivia was also the administrator. I have created the new blog and imported the xml.file and also added Olivia as an administrator.
All the comments that Olivia had made now shows my gravatar profile next to the comment and not Readolivia's.
Olivia's blog- http://oliviascaptures.wordpress.com/
The blog I need help with is mayanksmadhouse.wordpress.com.