The singer said she gave her bandmate a hard time if she struggled to master the band's dance routines in their early days.
But Scary Spice insisted that she has developed a more mellow attitude since their reunion, telling Grazia: "If Geri gets her dancing wrong now I tell her. But in the old days I may have done it in a bitchy way, but it's much more sisterly now. I want her to look fantastic and get it right.
"Everybody knows that Geri and I have had our problems in the past, but having time apart and then coming back together has been incredibly healing. We have a real bond and, amazingly, our daughters, Angel and Bluebell, are completely fascinated by each other."
Mel also revealed that Geri had been very supportive of her decision to sign up for US TV show Dancing With The Stars, saying: "I wanted to show everyone what I could do. I talked to Geri and she was right behind me, telling me to go for it and knock everybody dead."