You can get with your vet. They have a shot that will make her cycle without harming her. Then you can breed her at the appropriate age. That will let her grow and you will end up with a full sized calf and a full grown cow. It will also lessen the chance of having to pull a calf.My bull of 9 months of age got in with my young heifer 13 months old and she shows all the signs of being bred. What do I have to watch for and prepare for in June