I am looking at getting a horse that has been used as a broodmare. She's 6-7 years old. She is halter broken. She can lead and trailer just fine. She's due to foal for a 2010 foal sometime in March/April. If I do get her, is there any reason that she can't broke to ride after she foals? Do I need to wait until she has weaned her foal to start training her? And what are my options if I can start working her in the round pen pertaining to the foal?