"If she could be important to them again at this age, I think that would be amazing."
Despite the early discussions, Hilary doesn't want to get fans hopes up.
Though she has an idea of where Lizzie would be in her life.
She told 'Entertainment Tonight': "There's been lots of conversations about that. I'm racking my brain. I don't think she's a mom yet, but she might be getting there soon."
She added: "It's fun. I feel excited. It could be a possibility or it could be nothing, so we'll see."
The finale episode of the TV show ended with Lizzie graduating, whilst the spin-off movie saw her hit Europe with a vacation to Rome, Italy.
-Bang! Showbiz