The actress, who plays Jean Slater in the BBC One soap, admitted that their relationship goes a lot deeper than the pair both suffering from bipolar disorder.
Speaking to Inside Soap, she said: "Her relationship with Stacey is unique. Not just because they both live with bipolar disorder, either.
"There's a lot of comedy and they really care for each other. It's all a bit strange at times, but there's a huge amount of love as well."
Wright, who will leave Albert Square at the end of the year, added that she doesn't know how her character will exit the show, but said that she hopes to find "something different" for her next role.