OP, I hope you will understand how I’m intending this, because it’s sometimes hard to convey kindly in person let alone the interwebz.
I try and always, always keep in the forefront of my mind that every interaction I have with a horse must carry the intention to leave the animal better off than it was when I showed up. If I can’t muster the strength to do that on a given day, I don’t ride the horse. Or, I do something that is low-key but beneficial to the animal and doesn’t require maybe the focus or coordination that riding might. I say this as someone who also struggles with depression - BTDT and bought every souvenir in the gift shop, so to speak. So there’s not a thing wrong with showing up at the farm, petting your horse and leaving if that is what you can muster. The horse will be better off for it than they will by your trying to work through things while also attempting to get something done with them.
But if you are finding that the horse is your go-to happy place, the only place where you feel you can find some peace or sanity…well, you’re doing it wrong. You’re doing it wrong in the sense that it’s worth taking a look at the rest of your life and trying to determine why it is that the barn is your solace. Why can you not find peace in other areas? What does that say about your priorities or how you’re focusing you’re energy? I mean this in the kindest terms possible as someone who also had to examine why I was another one of those women that felt this way, because it’s so, SO common. It’s so common we say it and don’t even think about what it really means.
It sounds like you are making steps to take care of yourself - depression can be a long road to hoe but in my experience it does get better. Hugs to you.