City started brightly in the first 15 minutes before Bell tucked her shot into the bottom corner putting the visitors ahead.
Bell went on to register a 12-minute hat-trick and put her side 3-0 up. Her pace beat the Imps high defensive line leaving her with acres of space in behind.
City still threatened, Olivia Smith saw her long-ranged effort swiped away by the Cobblers keeper and out for a corner.
By half-time Bell had scored five goals, capitalising on multiple stray balls in the box that were not cleared away.
Two identical goals earnt Bell her double hat-trick, curling her efforts into the far corner whilst inside the 18-yard box.
City boss Charlotte Dinsdale said her side ‘played better in the first-half’ despite the heavy score line.
