I think it's fine to get out what you're thinking. And so what that you didn't space it very good? It's a rant, lol. You're just typing what's on your mind as it comes.
I would suggest just helping your friend understand how horses behave, think & feel. She's obviously not been around horses for long by the way you describe her. It seems she thinks she an awesome, natural horse person so I wouldn't burst her bubble. Just make hints and suggestions, lol.
I doubt that she'll ever see that post unless she's on this forum so I wouldn't worry about it. If you see your friend doing something wrong, don't get frustrated & ignore it, not everyone is used to horses. Just correct her as nicely as you can. I have to do this with my sister a lot. I give her 'mini-lessons', lol. Good luck!