Looking For A Trainer To Help Our 2 Cats Get Along

About the job

We have 2 cats - one is 3 (Nala) and the other is 14 (Mishi). They have been living together for the past 3 months, and with gradual increases in time spent together, have been exposed to each other on a daily basis for a little over a month. No matter what we try to do, Nala will not stop trying to attack Mishi. We have tried feeding them treats in the same room, playing with them, snuggling them, etc. There doesn't seem to be anything that will take Nala's eyes off of Mishi when they are in the same room. Both cats are full-time house cats and do not go outside. We are not expecting them to become best friends, but we do need some help with getting them to the point where they can tolerate and function normally around each other (i. e. eating, playing, sleeping, etc).