Ariel Winter -- I WON'T Talk to My Mom

Ariel Winter's lawyer told a judge today, the "Modern Family" star wants NOTHING to do with her mother ... and won't even sit in the same room with her.

Ariel's guardianship case was back in court, and mama Chrystal Workman complained ... her daughter refuses to do therapy with her mom. Chrystal wanted the judge to force Ariel into therapy with her mom, but the judge nixed the request.

The judge said he couldn't force a teenager to have a relationship with her mom if she doesn't want it.

As we previously reported .... 15-year-old Ariel is now under the guardianship of her sister Shanelle Gray, after Ariel complained she was being physically and emotionally abused by her mom. The court found emotional abuse and stripped Chrystal of her parental rights.