Thanks for the advice, it was great. I kinda figured it would be better to seperate them but I always like to hear from more experienced breeders. I bred rats years ago but they were sisters and had a massive enclosure so did fine with raising their litters communally. Cookie is a wee bit older she may well be bred much sooner than the new little girl rat so I will seperate them. So far they seem to like each other well enough, a wee bit of the typical rat boxing games and sniffing of "best bits" LOL but they are curled up in the sleeping box quietly happily now.
She has a name btw. I was just holding her and thinking she looked like a little grey nun in an old fashioned habit when the name Abby came to me. So Abby she is LOL.
~~Joanna~~