Burnfield was named player of the match and contributed the fourth of England's six tries in a 33-0 win, their third consecutive victory after drubbing Italy and Scotland.
Gary Street's side remain on track for a seventh consecutive RBS 6 Nations Championship as well as the Triple Crown and a Grand Slam, but Burnfield says they won't be getting carried away with Les Bleus to come in two weeks' time.
"You don't win a Grand Slam the third game in," said Burnfield. "We've got a massive game in Paris coming up and our thoughts will definitely be moving on to France.
"There's a big squad collective here. Personally we want to push ourselves and the person next to us whether it's during the game or off the pitch."
A good defensive display from Wales kept the score at 13-0 going into the break, but their resistance crumbled as second-half tries from Burnfield, Kay Wilson, Michaela Staniford and Sarah Hunter ensured England ran out convincing winners.
Despite the resounding scoreline which keeps England ahead of France at the top of the championship table, Burnfield was quick to praise Wales for frustrating the home side for so long.
"You've got to give credit to Wales," she added. "It took us a while to get settled in, but when we did we got back in there."