Stiffness
 

My eventer, who was always able to bend nicley and be on the bit well, had a few weeks off from a cut on her leg. Since I have been working her again, she is very stiff. I know it will just take time, but does anyone have any suggestions for helping her supple up a bit?

Do a lot of bend and flex workouts with her....also would not hurt to get her teeth checked out.
My mare was out for 6 months due to an injury and I had no issues with her being stiff when I started working her again, all horse are different so it could be the time off but I would rule out any teeth issues first.

circles, serpentines, hourglasses, figure 8s!

Warm up on a nice long loose rein, with lots of figures and other suppling exercises like shoulder in, haunches in, warm up w/t/maybe canter to stretch her out.

She'll come back!

circles, figure of 8s, serpentines, hourglasses, spirals!
My loan mare is stiff in trot at the start of our workouts, she needs a canter to loosen up but when it's icy I go back to bendy exercises

Try adding Rhux Tox to her food, its homeopathic, I use it on both my old deaddogwalking and my old horse who at 20 is springing around dressage arenas like a 10yo!