By Jasmine Allday EastEnders fans have worked out how Whitney Dean will make her exit from the Square – in a huge Sonia Fowler twist. Whitney was hit by a car at the end of a shocking episode, which saw Patsy Palmer make her return as Bianca Jackson. Whitney and Zack travelled back to be with Bianca in Milton Keynes, where they ended up meeting a young girl called Britney, who was being neglected by her mum, who was too busy and focused on her drug addiction than to be there for a daughter. Whitney found the young teen searching through the bins for food and took it upon herself to look after …