Speaking as a stud groom/manager of 40 years plus I would say to you don't try to go it alone. Especially if the mare hasn't foaled before. A lot can go wrong, not just at the time of foaling, but latching the foal on after birth, some maiden mares can be very clumsy, and even aggressive to...
take a look at Honeys Real Dog Food website, and get them to send you their free booklet. Lots of useful info on there, and they don't do a hard sell, they will advise anyone over the phone about raw diet and even making up formulas at home so as not to miss nutrients like bone out. Really...
Whats she registered with? A Native has to be fully registered with one of the indigenous breed societies such as Exmoor, Dartmoor, Welsh etc. Traditional is a term usually used with coloureds that aren't pure bred.
Bit of a Forum virgin so forgive lack of expertise in posting, hopefully I will get better as I go along. Looking forward to sharing all things horse. Breeding and rearing Sport Horses is my area of expertise so hope we can swap ideas. Been in the horse business 40+ years. x