Ennis-Hill, who has completed 4 events, was in 3rd spot at the end of Day 1, which tends to be her strongest, with a tally of 3928 points.
With two disciplines remaining, javelin and 800m, she has 4827 points - 283 behind leader Brianne Theisen-Eaton of Canada.
She needs a total of 6,200 points to enable her to qualify for the Rio Olympics in 2016. The Gotzis Heptathlon, in Austria, is the British athlete's comeback event following the birth of her son. She last competed in the heptathlon at the London Olympics in 2012, where she won gold, breaking her own personal best and set a new record, beating Sierra Leonian Eunice Barber's World Heptathlon Best by 0.08 of a second.
Ennis had been doubtful of returning to her full potential following recurrent injuries, and coach Toni Minichello, also a fitness expert, said she would not be back in competition if she was not back to her full potential. Ahead of heptathlon, Ennis had been unsure of her participation.
She participated in the Great Manchester Games earlier this year, coming in third behind British athletes Tiffany Porter and Lucy Hatton. Minichello and Ennis-Hill herself regard the meet in Austria as a 'stepping stone to Rio'.