The actress played Lucy Beale in the BBC show until being axed for alleged "unruly behaviour" and underage drinking in 2010, with Suffield's last appearance in EastEnders in August of that year.
Tweeting after the first screen appearance of her replacement Hetti Bywater in last night's episode, Suffield said: "I'm a bigger, better, happier person now. Great starting point for me but I've moved on."
Suffield then directed Twitter followers to a music video by the band Deadwax in which she stars, as well as writing: "We've got Casualty, a couple of films coming up.
"And yes, give the new girl a chance - it's a very tough job and I wish her every success. Like I said, I'm happier now and hope you all are x."
Bywater's casting was announced in November 2011.