She has flat feet in the front and they put plain shoes on her, doesn't look like it would give much traction.
Now is this your horse, or the ranch's horse?
How long have you been working with this mare?
Did you express to the farrier that she was being worked on the barrels?
I guess I feel like that her shoes should
have been considered well before you put her on barrels, instead of now questioning it after she's fallen two times. If she's in a plain flat shoe, and not a rim shoe, that may very well be why she's slipping. From the video you posted where she fell at the 2nd barrel, I can't tell which foot she slipped on because you cannot see her feet in the video.
I always make sure my farrier knows what I am doing with my horses so that he can trim/shoe accordingly. For example: I had to have my horse's front feet in a 2 degree wedge shoe for soundness reasons diagnosed by the lameness vet. So he put on a rimmed wedge (not a flat wedge) so that my horse would still have traction for barrels.
Our farrier said the angle of her fronts are too long and he wants to stand her up a bit more.
Now of course I have not seen your horse's feet up close and in person, but I kind of wonder why your farrier put front shoes on in the first place? If the toe is long and the heels underrun, all it takes is proper
trimming over the course of time, to gradually fix the angles. You don't really need a shoe to fix that, unless she has something else going on besides that.
Granted, maybe this mare would do well with shoes for the purpose of traction (a rim shoe, or a Razr shoe, for examples). I have my gelding shoed in the back for that purpose; he slips less with rims.
However, it's also possible to consider that if the angle of her hooves are off, she may have an increased break-over point and that could be affecting the way she moves.
Just some thoughts.
No check by lameness specialist yet or chiropractor but I think I will go ahead and take care of that soon just to make sure. Maybe figure out if she's off or not.
I think that would be a very smart decision. Even if she comes up clean, then at least you've checked.
My bf was teaching me to run barrels. He says the best way to keep a horse OFF the barrel is to get your horse's nose past it BEFORE you turn.
I personally say that you want your KNEE at the barrel (at a minimum), or have your knee past
the barrel before you start the turn.
But I suppose it would amount to the same by having the nose past
the barrel ... versus your knee at
the barrel. Tomatoes, tomaatoes.
He also says to start out WIDE in the turns. You can always bring the horse in closer, but its harder to bring them out.
Absolutely. It's much easier to correct a horse and move them in tighter, than it is to make them give you more room in the turn.
Plus, when you are starting out slow loping with a horse, you want to give them MORE room in the pocket around the turn. Once you speed it up, you'll find that all your extra room is gone. That turn really tightens up when you add speed.