The former EastEnders star last year vowed to end her 20-year battle with addiction and checked into rehab.
In an emotional post online she swore to do it “once and for all for myself and my kids”.
At one time she used so much cocaine part of her nose collapsed.
But the actress still appears to be using drugs after bombarding a friend with texts and calls for a “fix” during a jaunt to Gran Canaria three weeks ago.
The pal, who asked to remain anonymous, shared the star’s texts and messages from her verified Twitter account with the Daily Star Sunday.
“Get the proper flake though as that coke last night that we got was rubbish”
In them, Danniella writes: “Are you okay to get the sniff? Get the proper flake though as that coke last night that we got was rubbish and try get 6 love ya baby doll.”
Later, in response to a query about her location, she adds: “F**k knows some s**thole. Leaving in ten where shall I come babe. Did you get the bits?”
The friend, who claims he is not a drug dealer, told us he had known Danniella almost 10 years.
He said: “We have regular contact, but especially when she is wanting a fix. I could always point her in the right direction.
“She knows I am often in the Canaries so was on to me looking for drugs. She was extremely desperate for a fix, ringing me continuously and begging.
“I have decided to share the messages to try to shock her into action. Every year she says she’ll get clean but every year she seems to relapse.”
Last week Danniella claimed a stalker had stolen intimate photos from her iCloud account. The desperate star reported the woman to the police and then released her own private snaps featuring topless shots, nudity and skimpy lingerie.
She said: “Rather than let someone hold me over a barrel… I thought it’s just easier to put these pictures out [myself] and say ‘This is what I’m up against’.
“Every girl takes pictures in their underwear.
“I’ve been into my fitness a lot recently so I do take pictures, they’re on my phone…they’ve not been sent out – she’s got access to pictures I haven’t even sent anywhere…
“But I’ll be damned if I’ll have someone making up lies.”
Last March, Danniella vowed to seek help after appearing on TV show In Therapy.
The former child star wrote online: “So I’m checking in to treatment again.
“Am I scared? Yes. But I do want a quality of life I don’t have today and the freedom of a life without demons.”