The actress is currently on a break from the BBC show and viewers recently saw Carol's exit scenes as she moved to Suffolk temporarily with her grandchildren.
Coulson revealed the reasons behind her EastEnders absence as she made a live television appearance on Loose Women today (May 15).
She commented: "I just needed to not have [Carol] in my head for a little while. When I signed last year, I just said, 'Would it be okay if I could have a little time out?' And they kindly said yes."
Coulson continued: "You've constantly got somebody else's life in your head at all times. You do the 12-hour day and then you come home and you have to learn again for the next day. You're doing 15, 16 scenes a day."
The actress has been working on charity fundraising projects since filming her recent exit scenes, as well as spending time with her family.
She added: "[EastEnders is] a perfect job - for me it's 25 minutes up the road with lovely people. I really like working there. I'm going back in August, actually."