Thanks everyone for the advice.
I think you're right. I feel like I'm just in a rush almost, to find something to fill that hole. I know I should take more time to mourn Indie, and I think in a way, I always will mourn for her... but hopefully one day, I'll be able to talk about her without breaking into years.
I'm sure she'll lead me to the right horse when the time is right, so until then, I'll just keep visiting her grave (although I already told her I'd visit it until the day I die) and doing my lessons, even though I don't think riding is going to be even half as fun without her.
Forever loved, never forgotten; my beautiful Indie. <3 Hoofprints on my heart.