The 75-year-old singer discussed Hudson's role as Franklin in the new biopic Respect during Monday's episode of Watch What Happens Live.
"She called me like a month ago," LaBelle said of Hudson. "She wanted to come to my house, and we're going to go over my back-in-the-day moves when I was singing with Aretha and all of the things in our back-in-the-day time.
"She wants me to help her with this movie by giving her some info, and that's my baby girl. She's phenomenal."
LaBelle performed with Franklin on several occasions, including the "Women of Soul" concert at the White House in 2018. LaBelle denied that Franklin snubbed her at the event.
"No, she really didn't," she said. "I think she was going through her illness at the time. She'd been sick, I think, for awhile. She was snapping at people, but not particularly me. My feelings were hurt but I really understood later."
"It blows my mind," Hudson said. "I've always looked up to Aretha and to portray her -- I can't even speak about it because it's like, 'Oh, that's a huge task.'"