I have three cats and they were all a bit scared of Bella when I brought her home (she was oh-so-tiny!) but for the most part, they just stayed aways from her.
One of the bolder cats, Whisper, would go up and sniff at her but that's about it. Bella would mess with them a little, but the cats that didn't want her to would hiss, and she would leave them alone.
She plays really well with one of our younger cats, and the middle one tolerates her and she, he.
Like someone else said, when the cats don't want to be around her, they go high.