Colostrum… how often to milk

My husband brought this doe home. She is a first freshener whose kids died. She had them two days ago. Her teets are tiny and one was completely clogged. I was finally able to express some colostrum this morning from both one teet producing double. My question is how often do I milk her and how much colostrum should I be getting? When will her milk come in? Does it matter that she has no babies? Her udder is very hard and this is my first time with a doe who didn’t come to me after weaning her kids off first