My fat cat Peanut (16 1/2 lbs) loves to play with Bella. He will actually initiate play, and then wrestle with her.
Whisper will tolerate Bella, so Bella basically leaves her alone. I've even caught them laying together. Well... once, but it was so cute.
Sasha we have trouble with. She's our oldest cat (around 10 yrs old) and she HATES Bella. So... everytime Bella is around Sasha hisses and growls and that sets Bella off barking and chasing her. It's like come on stupid cat if you stopped hissing and growling at her she'd leave you alone!!!