Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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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 Tamara,
I can certainly understand your concern about overfeeding, so you are wise to pay close attention to how much your foal receives.
Yes, Evolution appears to be fine (based on their website) for a growing foal since it is low in starch (starch can increase the incidence of osteopathic disorders in growing horses). So, you can feed it in small quantities in a creep feeding situation. However, I do not recommend feeding minerals free choice. Horses cannot assess their need for most minerals, with the exception of a few electrolyte, so it is better to feed them according to need. For that reason, I would recommend a vitamin/mineral supplement designed for growing horses, such as Mare/Foal IIP.
It's true that Evolution is fortified, but you would likely need to feed too much to get enough vitamins and minerals.
So, bottom line... feed all the hay she wants, no oats, 30% alfalfa, and you can use the Evolution as a "carrier" for a supplement. Also, you need to pay close attention to lysine content, so having your hay analysed is your best bet. Otherwise, you may need to supplement this essential amino acid.
Congratulations and if you need further assistance, please consider visiting over the phone so we can go over the big picture and customize a proper feeding plan.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO