The wacky wigmaker who wantonly mowed down a Brooklyn mom and her two young daughters scored a sweetheart plea deal over the objections of prosecutors.

Miriam Yarimi, 33, pleaded guilty last month to manslaughter after Judge Danny Chen offered a 3-to-9-year sentence, records show.

The deal was far less than the 15-year maximum sentence sought by Brooklyn prosecutors, who plan to submit a letter ahead of her Wednesday sentencing detailing the many reasons they contend Yarimi should be locked up longer, officials said.

Yarimi rocketed her luxury Audi A4 down Ocean Parkway in March and crashed into an Uber, sending her sedan careening into mom Natasha Saada and her three children — killing her daughters Diana, 7, and Deborah, 5, and leaving her 4-year-old Philip grievously injured.

“The

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