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Rosie O'Donnell must be pretty worried about the well-being of her daughter Chelsea right now ... because the comedian's child is set to spend time in prison.

Here's the deal ... the actress shared a photo from Chelsea's younger days on her Instagram account on Wednesday, and writing "she faces a scary future-- prayers welcomed."

She said her daughter has been dealing with substance abuse issues, and her battle with addiction "took over her life."

Chelsea's reportedly been struggling with addiction for an extended period of time. She was sentenced to six years of probation in January following several arrests ... all of which involved drugs, according to Us Weekly . Getty

However, a Wisconsin judge sentenced her to prison after she was accused of breaking the term

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