The actress's character Kat Moon's baby was swapped by Ronnie Branning (Samantha Womack) when her own child died from cot death.
Wallace told Bang Showbiz: "I stand by it. We're actors at the end of the day, we do our job and then we go home. It's drama, that's it."
The star also praised Womack's acting and said that she is sure her castmate will move on to "bigger and better things" once she departs later this year.
She added: "[Samantha is] a fantastic actress who played a brilliant role in a fantastic storyline so I wish her all the best."
> Maslen: 'Womack may return to 'Enders'