we have 3 chick in the house still with the mama they are almost 4 weeks and we have some other chicks that are a week behind them and want to put them with them but the mama wont let ti happen , think the older ones will be fine with out her , can i just put her back out side with out them or will she flip out they still sleep under her a night abd it is to cold out side for them still i think so what should i do thanks for any help