Hello, may I suggest perhaps a different formatting style? It is a little difficult to read your concept at the moment, unfortunately.
In regards to the kit, when you mean "lance with a war axe like tip" do you mean a halberd? Besides that, I'm not a super big fan of the passive. It feels extremely situational and makes her auto attacks really easy to counter. While I can understand the fantasy, it's probably not something I would recommend in terms of a passive. Also, it doesn't really make much sense for her to be able to buy a special pair of boots... doesn't really fit in and feels pretty random.
The Q... I'm sorry, but I cannot really understand what you're saying here. Do you mean she runs through an enemy, or does she throw an enemy? Also, holy dm is not a stat I'm aware of, and I would appreciate it if you would elaborate.
In terms of the W, I can't say I'm really pleased with it. Only being able to heal yourself when you have that low of health is a bit upsetting, seeing as if you're that low you should be backing off anyways. If you're worried about the heal being spammable give it a long CD so it can't be at earlier levels.
I was unaware she was riding a horse, but alrighty. A horse biting and rooting someone doesn't make much sense? I cannot think of a situation where it would.
The ultimate is pretty unique, but I feel like it would be difficult to use in League. It feels more like an extremely situational and difficult hook more than anything.
Also, I suggest taking a look at doing numbers for future concepts. While they may be difficult to deal with (I know the feeling), it helps people to get a better grasp of what you want to do with your kit... also, may I suggest saying what kind of damage they do in the future? Whether it be physical or magical, it would be heavily appreciated! Oh, and I can understand wanting to get an idea on a kit before posting the lore, may I suggest including a snipit of a lore idea you have for your concepts if you want to do it this way? It helps in understanding the theme and that of what you're going for!
Please have a lovely day, and let me know if you have any questions or concerns.