The 27-year-old, who announced her split from Needs in March 2016 after 18 months of marriage, said the couple still spend time together at home.
Explaining their separation hasn't made a difference to their daughter, the former gold medallist said both parents work around their busy schedules to see her.
"She doesn’t have a clue that we’re separated," Adlington told The Sun.
"She’s only young, so all that she knows now is that all both her parents love her, and that’s the thing that is very important to us both."
Adlington added: "When there’s a child involved, breaking up is so different, because you both want the best for them. And we absolutely adore her."
She revealed she and Needs have an app on their phones that lets them share calendars and see what each other is doing in terms of their work schedules.
The mum added that they haven't "divided up their time" half and half of when they can see Summer, it's more to do with when they are both working.
At the time of the couple's split, their joint statement said they were on amicable terms.
"We move forward with respect for one another and our focus and commitment is on parenting our gorgeous daughter Summer," they said.
Speaking to The Huffington Post UK in June 2015, Adlington admitted that she hoped her daughter would grow up to love swimming just like her mum.
“She’s been to the pool three times already!” Adlington said. “She first went at three and a half weeks and she absolutely loved it!
“It’s nice to go to the pool together - she’s too young to go to the farm or zoo because she can’t play but swimming is one of those things where, because she’s awake, you can feel like you’re doing it altogether.
“Me and Harry have both been each time we’ve taken her and it’s amazing for her to build confidence in water.
“Hopefully she’ll grow into a little swimmer and learn to love and be around water.”