Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Athena,
During this last three months of her pregnancy, her calorie needs increase dramatically, since she will be gaining 1/2 to 1 pound each day.
So, I would suggest two things. First, give her some alfalfa hay in addition to her grass hay. She needs the extra protein and calcium. And, I would also remove the ABC free choice minerals. She is not able to assess her need for additional minerals, with the exception of electrolytes (sodium, potassium, and magnesium). And, her needs and the needs of her growing foal are not being met in this fashion.
Instead, I would recommend feeding a supplement designed for pregnant mares such as Mare/Foal IIP. Since you are already feeding a complete ration, she may not require the full dosage of this supplement, so go with half of the dosage. This is not exact, but that's where the problem exists with feeding commercial rations along with supplementation. But, it will boost the vitamin/mineral content of her diet, which she needs right now. And, after the foal is born, her needs will be even higher due to lactation requirements.
Make sure she has grass hay available to her 24/7 and is drinking plenty of clean water.
Happy Foaling!
Dr. Getty 
Where are you from? Bayfield, CO