All you can do is try, personally if the bigger ferrets still a kit it may be easier than trying to introduce new kits to an adults territory, i would find some secure neutral ground such as a small cage, put the bigger jill in the cage & let the kits sniff her from outside the cage, then swap bedding from the kits cage to her cage several times , you may be lucky & they get along right away , but take your time , do it over a week or so if the initial intro's are a bit dodgy, just keep trying , but if either party become to stresssed i wouldnt push itthings tend to have a knack of hap