Please help me :(

how about you do ground work with her and teach her tricks, or do a fun Western Parour with her? Iam not a fan of people getting rid of their horses just cause they cant do much anymore. In the end of the day they are animals and deserve to be respected. A Horse just like a dog should be for forever not being basicly tossed out cause they served their duties. There is so much you can still do with horses that have had injuries, they deserve just as much as any other horse to be treated like a Animal/Family Member and not be treated like Sport Equipment.

And iam not trying to be rude to you about this, iam sorry if it sounds this way, i just like people to really think.

If you do want to do showjumping then yes you will need another horse, however we can not really tell you on what you should do.

How much experience do you have with show jumping? if it is a little to non then yes go to a school first and learn it proper before you buy yourself a jumping horse and then ruin the horse by doing it wrong.

If you have alot of experience then maybe loan a horse that has the option to buy in the future, that way you can look if the horse is actually something for you or not.