My 4mth Cockapoo And 2 Cats?

We have two cats that we have had for years. They were both inside outside cats, who slept in the house most nights. We brought bella home about two months ago and the cats hate her. I figured that after a few weeks they would all get used to each other, with the cats teaching her her place. They have moved outside, i was worried about food and had to put their water and food outside for them as they never come in anymore. As soon as the cats see her they take off running and then of course she wants to chase them. I tell her “no cats” in a firm voice, but she still jumps around and barks when she see them at the slider. One of our cats is getting more courageous and will come in the house if bella is crated but not very often. Ive never had cats not school a dog before especially if they were here first. I miss my kitties, i know constant training and reminders should teach bella to leave them alone but what about the cats? ITs been two months!