You are still to give information about her age, previous foaling,if you intend to keep the foal sell it on, her previous riding, what you want the foal to do.
Do you want a decent horse size or are you looking for a pony?
Where is she going to be staying for birth etc? Have you experienced people at hand through out her gestation ad birth should something go wrong? Are you sending her to stud or small breeders? How far are you willing to travel? How much can you afford for stud fee? Have you got a reliable vet who has been involved in foaling? If circumstances change are you willing to sell your foal?
All of this information needs to be considered.
Also to go to stud your mare can't have hind shoes and must have all vaccinations.
To give a horse your heart guarantees a love that will last forever undamageable