It is possible but it depends on the hen. Some hens will happily accept little chicks. Some hens will hatch their own then attack them.
If she has seemingly accepted one I would think she would accept more. Keep a close eye on her to make sure.
Personally I’m hoping to attempt this myself in a month or so. I brooded chicks in my house. It was nice to keep an eye on them but what a mess. Then I had to introduce them to the flock. When I had a broody hatch chicks they were accepted right away and no mess in my house. I found it much easier.
Just be prepared to brood them yourself in case she doesn’t accept them.[/QUOTE