Emma and Louise are 6 1/2 months old, Muffin is 2 years old , this week!

and---so much for Emma and Muffin getting along...that changed today.I do not know what to do...almost at wits end, I am going to separate them , one gets part of the house and the other 2 get the other part. then what? I wonder if I will have to do that from now on or just a while...it has been 2 weeks today that they have been here, and they have gotten more and more friendly each day, Emma actually got on my lap tonight, and the last couple days, Louise has let me pet her. but the hostility is getting worse too.I probably should not have brought them into the house, I just wanted to foster and help some cats, now things are worse...Poor Muffin has been thru so much in her 2 yrs, being a stray, then to my nephews house, to mine, to adusting to cookie, losing her, now these 2...
I guess I might have to give them away, but that hurts, I don't want toand I don't want to keep Muffin upset.well I am just typing away, trying to figure this out, I take Emma and Louise to the vet on Thursday, will see what she says, maybe she will know someone that will keep them together