Cat to the Dark side

[Reduped]

Hi, i've got too young house cats (6 months ish) who are sisters and up until yesterday they've been very good friends. However, yesterday evening one of them fell from the window of my flat (she's fine) but after I brought her back up her sister has turned on her. She's been hissing and spitting every time the other ones come near. Has anyone got any suggestions of how to make them friends again.

[Peri]

I would wait a few more days.  We had two cats who were great friends.  One had an allergy and had to go to vet more often and everytime she came back the other would hiss and growl for a few days and then everything would go back to normal again.  The smells are different - I think that is the problem

[Reduped]

Thanks for that, I needed a bit of reassuring

[Peri]

Let me know how cats are doing.  Love cats have 2.  1 male and 1 female.  They are 1 1/2 years.  We got our last cats 18 or more years ago.  One lived to be 17 and was blind at the end.  I still miss her. 

[Reduped]

There both fine now, although they were on heat last night making for a very bad nights sleep.