New kitten is terrified of her own shadow

Well, as some of you may know, my family just got a 3 year old girl kitten, she does not have a name yet, but nicknamed Sweets, is afraid of her own shadow. Now, I knew that she and Sammy would not get along at first. But when she saw Sammy, she hissed at him, and they got into a fight. Now, she runs into my room and hides under my bed untill Sammy is 500 feet away from her, basically. Right this instant, i am in my basement with Sammy and Sweets, and he is staring at her, and she is hiding under the guest bedroom bed.
Now, I know this will go on for a couple days, but what do i do with her?

Give her a safe place to be, even if only a high up place she can jump to in a corner where he can't follow (no room for him to get onto the perch, but wide enough for her stretch out). And relax, they'll figure it out in time.

Originally Posted by Larke

Give her a safe place to be, even if only a high up place she can jump to in a corner where he can't follow (no room for him to get onto the perch, but wide enough for her stretch out). And relax, they'll figure it out in time.

Click to expand...

This was the case with Persi & Alley and look at them now.

Thanks you two!
But Persi and Alley are so close!