What behavior should I expect when i put new kits in with an older rabbit(6+yrs) in her hutch?

i have an older spayed female rabbit and we have recently adopted 2 babies-1 lop mix and 1 lionhead. the babies are both about 4 weeks old. we have put the babies in with older rabbit and i am concerned about our older buns not eating as much and ping as many pellets as she usually does. Are there any concerns i should aware of?