Being toed out isn't a death sentence, just not something I would want to be passed on..If I'm correct, I even think it can be slightly corrected with corrective shoeing..
Toed-Out/Lateral Deviation of Pastern from Fetlock/ Fetlock Valgus 
An angular limb deformity that creates a toed-out appearance from the fetlock down.
A fairly common fault
Creates excess strain on one side of the hoof, pastern and fetlock, predisposing the horse to DJD, ringbone, foot soreness or bruising.
The horse will tend to wing, possibly causing an interference injury. May damage splint or cannon bone.
This conformation diminishes the push from rear legs, as symmetry and timing of the striding is altered with the rotated foot placement, particularity at the trot. Thus, stride efficiency is affected to slow the horse’s gait.
The horse is unable to sustain years of hard work.
Your mare's feet
A toed out horse's feet...considerably similar to your horse's feet..
She looks slightly toed out to me. You can see her hind foot in this picture as well and it turns out.