Lauren is left distraught next week as her cousin Joey (David Witts) calls an end to their blossoming romance, having been blackmailed into doing so by his dad Derek (Jamie Foreman).
Not realising that Joey secretly still has feelings for her, Lauren struggles to cope with her heartbreak - which could tie in with reports that she will go off the rails again in the build-up to Christmas.
Asked by All About Soap whether Lauren will start drinking again, Jossa replied: "She's never really stopped! Booze is her comfort blanket. And if she doesn't have Joey, what else has she got?
"Her family are great, but the only person she wants to talk to is Joey."
She continued: "Being with Joey is good for Lauren - she doesn't get as drunk when she's around him, and I really dread to think how she'll be without him now."
Jossa added that there will be tensions between Lauren and Derek if she ever finds out about his blackmail.
The actress said: "She'll kick off big time. She really hates Derek and although they used to get on quite well, their relationship has changed and this would just be the last straw."
EastEnders continues tomorrow (November 22) at 7.30pm on BBC One.