bringing to the trot helps too and softening her up.
I use that a lot with Red. When his head comes up, or he won't lope nicely for me, or what have you, I ask him to trot in a small circle until he relaxes again and drops his head. Then we go back to what we were doing. If he still has a problem, we do the small circle trot again. Trotting in a small circle has almost become his "cue" to relax because I use it so much in that fashion.
Yes, I see great improvements too! It'll just take a little time to get it to correlate into her lope, and to get into her muscle memory.
At about 4:08 in your video (for one example) you went almost all the way around the circle, pressure on the reins, but she did nothing but keep her nose in the air, and gape on the bit and ignore you. THAT is the type of thing where if she doesn't give to you in a couple strides at the lope, then you've got to immediately put her into a trot and small circle and make her give, give, give to the inside and get soft again. Then try the lope again.
When you are loping, exaggerate that bend even MORE for now. Really ask with your inside rein and inside leg. Don't worry about slowing her speed down (so don't try to hold her back with both reins). Make your loping circle smaller if you have to. And don't worry about trying to force her head down with both reins. Just try to get bend
. Because when you get bend and softness, gets what happens to the speed? She'll slow down naturally.