The 27-year-old, who won gold in the Olympic heptathlon last year, suffered the injury shortly after competing in the Anniversary Games in July.
"It has been quite a long process, but I am recovering well," Ennis-Hill told Sky Sports News.
"I have been just following my rehab programme, doing what the doctors and physios tell me to do and getting back into full training slowly.
"I think every year is a big year in athletics, there is a Commonwealth Games and then another World Championships and then Olympics Rio. It does come around really quickly but there is always something really important to focus on each year."
The Commonwealth Games take place in Glasgow between July 23 and August 3.