Cissy and Whitney Houston*According to TMZ, Cissy Houston, Whitney’s mother, was shocked that the singer was using cocaine at the time of her death.

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However she believes the relapse was triggered by anxiety over Whitney’s comeback plans.

The site also says that sources close to Cissy say she told them that she believed her Whitney was completely sober while shooting the movie “Sparkle.”

But Cissy says as Whitney got closer and closer to the Grammys — where Whitney would make her comeback move — she fell prey to the drug.

Cissy is saying hearing that Whitney was using again is like reliving her death — it’s that painful.