Hmm, she needs to use the base of her neck more, so lift your hands slightly and 'pick her up' with your seat and thighs.
She is bending to the outside so add inside leg and, if needed, more inside rein. (remember, insider leg and rein INTO the outside contact, so, in other words dont loose your outside contact.
Excersises would be lots of circles (big and small) to help get the inside bend and swirling (big circle spiralling into a small circle then back out again)
For me, thinking that my horse has a frame around her, like a box, and keeping her in that imagenary frame I created helps alot.
Sally Swift and her book Centered Riding is very good too.
Hope this helps.
If you love something, set it free
If it comes back it's yours
If it doesn't, it never was