I wasn't planning on separating my broody from the other hens, but on the 2nd and 3rd day when the chicks were more mobile, the other hens started pecking at them. Mom wasn't protecting them from the other hens and just let them get pecked at. This bothered me, but I figured they would work it out. I came home from work that day to a dead chick, looked healthy and was running around that morning, it didn't even look like it had been pecked at. I have wondered ever since then if one of the other hens killed it, maybe not. But I took action and moved her out after I saw one of the hens grab a chick real hard and swing it around, not worth the worry.
If you really want to break her broody and not separate her, try other methods 1st before just throwing some chicks in the mix. Well, that's what I would do....no expert here though