These are just things to think about as an older rider.
Somehow we get the idea that difficult horses make good riders pounded into us. Unless you can handle the quirky, nervous, unpredictable, inconsistent, difficult to downright untrustworthy, you are not a good rider. Tough horses make the best riders, if you cant ride them, you are a product of bad instruction by lazy trainers on push button horses, bad and/or unsuitable horses make great riders.
NOPE, they don’t. They make defensive riders. At best. For Adult riders over 40, they can and do shatter confidence and instill self doubt. BTDT. Fear of serious injury increases because it hurts more, takes longer to heal and can result in missing work which is no joke. OP here travels for work, no fun in a cast or nursing a shoulder injury.
While you cant dwell too much on the possibility of injury…its in the back of an older Adult mind and grows in importance as you hit your 50s. It takes a special trainer to work with older Adult riders, with most trainers burning out by 40 and so many 20 somethings out there, it can be hard to find the right one. One who really understands and is not just seeing a commission check and regular lesson/pro ride income stream and stands ringside hoping you don’t screw up and fall off. Think about it. They should be making choices that build YOUR confidence, not just support their business. Just think about that. There is an unavoidable conflict of interest in the trainer-client relationship.
You need to be able to sit down and discuss your feelings and doubts with trainer and s/he needs to work with you, not sugar coat your feelings and sign you up for another show you don’t have time to properly prepare physically and mentally for. Telling you you are doing great, horse is too, you’ll be just fine. Again. Not helping any older rider.
Far as the horse here, leave her out of this for a few minutes. Have you ever taken an over fences lesson on a real schoolmaster? One who jumps anything from anywhere? Land and asks “ where to and at what speed” and patiently waits for you to get rebalanced after landing in a heap? How about when you land and find yourself slipping left and the horse steps left to stay under you? Ever ride one that tries to stay under you? They are wonderful, you don’t have to worry if you land slipping left in the tack, they are bolting off to the right, throwing in a buck, or both.
Can you skip some shows and put the money towards some jumping lessons on a kind schoolmaster? Restore your confidence and strengthen you riding. Trainer might sell you some Pro rides but mare will pretty much be the same horse when you ride her. Remember, mare picks up signals from you and is probably losing confidence in you, vicious circle.
Remember, you don’t have anything to prove to anybody by sticking with a horse that was perfect for you. When you were 22. Try looking for a short term lease or, maybe, arrange 4-6 lessons on a KIND Professional Packer. See how you feel after that.