"Of course I am [ready for her to have a baby]," she told PEOPLE at the launch event for the Lorraine Schwartz "2BHAPPY" Jewelry Collection at LAVO in New York this week. "What grandmother isn't? I can't wait."
And, Knowles adds, her daughter and husband Jay-Z have what it takes to be "great parents."
"They're good people and they're really positive and they're talented and they've had a lot of practice with my grandson – their nephew," she says. "So I know they're going to make great parents."
Her daughter, especially, is "very caring and patient and loving," Tina says, "so I know she'll be a great mom."
Whenever Beyoncé and Jay-Z are ready to welcome their first child, they can always turn to Tina for parenting advice. As for raising her two daughters, she always tried "not [to] put pressure on them to be what you want them to be."
And while her daughter has found massive success, there's one thing she hasn't quite conquered yet.
"Cooking is the one thing she hasn't gotten into," says Knowles. "She hasn't mastered [it], but I'm sure she'll be a good cook once she makes up her mind."
How the power couple will be spending Thanksgiving?
"They're actually out of the country, so it's going to be different, but it'll be good," Knowles says. "They're getting their own tradition – so we have to let go."