Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hi MJ,
You could feed Quiessence with Accel, without any problem. Offer 1 to 2 ounces per day, depending on her size.
Try Quiessence first. If this is not effective, then add a B Complex (BPlex) to her diet. This, too, is fine with Accel.
Keep me posted!
All the best,
Dr. Getty 
P.S. In addition to borderline nutrient deficiences, wood chewing and manure eating can simply be due to boredom. She might enjoy a toy! 
Where are you from? Bayfield, CO