Please don't teach your horse to rear up as a "trick". My friend's teenage cousin taught her horse to rear up on command despite several warnings not to because it was dangerous. But still she did it when no one was around. Well one day when riding her horse reared with her but this time he fell backwards on her. She fractured her back, broke her pelvis and one of her legs. And as horrible as that was thank god she didn't end up paralyzed or killed. So I hope the liberty training isn't you wanting to teach her that by "making a bad behavior good". But as far as the following without the lead and coming when called those are great things to teach I do the same with my horses. I think if your wanting to teach your horse something training wise I'd immediately get started on teaching her not to rear. The older they get the harder it is to break trust me I know from personal experience. When she rears move her feet, I'd be keeping a whip handy to break that problem. Be safe. I hope I'm not coming off mean I just don't want you getting hurt. Keep learning you sound like you've taught her a lot. Just make sure you teach her things that make her safer to be around not worse.