Ok so, your arms are too straight, keep your elbows in and your hands are too far apart as well as youve got puppy paws going on.
That's all im going to say about your riding, now for your horse. I have no Idea why your riding in that bit with two reins? Because obviously your horse does not know how to give to the bit and I guess you just think more contraptions will help her respond better. Im sorry for being so blunt about it.
What you really need to do is get a plain snaffle and teach her to give to the bit, its really the ground baisis for training but you would be amazed at how many people skip it, but it really is the key to having control with your horse. As well with this you need to do bending, you see how she has a big thick neck on the bottom and none on the top? Teaching her to give to the bit will help build muscle on the top of her neck as well as give her a nice headset, making her more collected and easier to get into a frame.
Sorry if I don't sound the nicest, but I don't do the whole *****footing around thing.