She ran a very tight ship, and I had a very not tight ship," O'Donnell said.
She commended the talents of all six children in the family.
"But she's an amazing mother, and those kids are concert pianists and artists and singers. She is pretty phenomenal," O'Donnell said.
A production insider praised Mercy's demeanor on set.
"She is lovely, just the sweetest most adorable girl," an insider said.
Madonna's History with Cohen's Show
Host Andy Cohen previously discussed his persistent efforts to book Madonna on his show.
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"Madonna still has not done the show.
I'm actually kind of over it because in my Notes app, I was keeping a long list of interview questions for her in case she ever did the show, and she's kind of answered a lot of it," Cohen said.
Cohen recalled reaching out to Madonna regarding attendance at one of her live performances, which drew a critical response.
"She said to me 'Stop having people trash me on your show,'" Cohen said.
He analyzed why the pop star continued to decline his invitations.
"I think she sees me sitting there with the guest and I'm guilty by association," Cohen said.
During a Brooklyn stop on her Celebration Tour, Madonna addressed Cohen directly from the stage.
"If you say one more bad thing about me on your show, you're gonna get in so much trouble," Madonna said.
She playfully teased him before continuing her concert.
