It sounds like your bitty kitty has been taking lessons from Griselda, that's exactly how she controls our boys :)  She's about a third their weight but advances on them eyes and hair akimbo lol.  Biff, who beats up all the neighbourhood toms runs away.  Jasper has been known to flee from agressive beetles, so we don't really count him.  Jasper, on whose tummy Mrs. B can blow raspberries (bronx cheers), was flagged as vicious in the cat's home.  He wasn't vicious, he was claustrophobic and the cages there are pretty small.

We're so glad that Bubba is taking to bitty kitty so well.  All the best to you, her and the rest of your family.