As revealed in reports over Christmas, Debbie hatches a get-rich-quick scheme in an upcoming storyline, targeting village newcomer Dominic Andrews (Wil Johnson) with her plan.
Debbie even changes her appearance as she indulges in the risky behaviour, wearing new clothes and sporting a darker hair colour.
Webb told All About Soap: "She becomes very business-minded, almost overnight. She suddenly goes through this massive change, to her looks and her hair.
"It's all about earning money for the kids. She's determined that no-one will ever be able to screw her over again."
Debbie's antics come as she continues to struggle with being betrayed by her ex-partner Cameron Murray (Dominic Power) and aunt Chas (Lucy Pargeter).
Webb continued: "She's watched her mum and dad do what they want and get what they want for years. Now she's saying, 'That's it - I'm like you'.
"Even Charity's shocked, but Debbie's got a one-track mind at the moment. She just wants to become a mini-Cain. The Cameron thing has left her completely broken, and this is the only way she can get through it. She's putting on a mask and pretending everything's okay."
Emmerdale continues tonight (January 2) at 7pm on ITV1. Get the Inside Soap magazine on your iPhone or iPad