Sorry to hear you're having a hard time Maple. There's something that happened with my mare and I that I usually don't talk about coz I'm ashamed, but I think it'll help with your situation.
Misty (my mare) had never really bonded with me, but she didn't hate me or anything. Then, we had a really bad accident. I had to go to hospital and was in bed for a month. So the last time she'd seen me was when I was on the ground, screaming in pain, and then I "disappeared" for a month.
After that, she seemed to hate me. I thought she blamed me for what happened, but more likely she could sense the emotions of me blaming myself. Everytime I tried to pet her, she tried to bite me. Ears were always back. She wouldn't come to me at all.
After a while, I lost so much hope and blamed myself so much, I totally retreated from her. I wouldn't groom her, wouldn't hold her for the farrier, made my parents feed her, etc. I am SO ashamed of my behaviour. I was a teenager and reacted very immaturely, but I felt rejected and blamed myself and didn't know what else to do.
Someone told me I should put her in the harshest bit I could find and ride her again to show her who was boss... thank God I didn't do that. I ended up getting an amazing trainer who, within one session, had me riding her in a halter!!! But... she still didn't love me.
It was when she came down with colic that I realised how much I love her. I walked her all night, prayed, told her how sorry I was and begged her to forgive me. Logically I know she didn't understand, but I think she felt/sensed my emotions, and from that day on we've had an incredible bond. Something changed that night, now she comes running to me, whinnies anytime she sees me, falls asleep in my arms...
I'm not saying give your horse colic haha, but I only did one session with a trainer. I think, if I'd continued with it, he would've helped Misty and I to build our trust and respect for each other a lot sooner.
Sorry for the massive essay, it wasn't meant to be this long, but I really hope it helps. Sometimes (even though you're experienced and a trainer etc) it really can help to have someone on the outside, looking in, seeing what you can't see and giving you that helping hand to build up a relationship.
And as people have said, two months isn't very long for a horse. A big lifestyle change will need time, but I REALLY think some sessions with a trainer will be a massive help xx
Satin Reign aka "Misty"... my life, my love, my everything.