The love was not planned but when it is there plans can be adapted.
Exactly, it was her love for Malcolm and the goodness of his heart that gave her hope for the world. That hope was Harry, but even hope has to be protected, a life is a fragile thing. To give birth to a star born, the conditions have to be perfect, stars and planets in perfect alignment. So if she wanted to give birth with that in mind, she had no choice, so that was planned. Which is no different than couples everywhere trying to get pregnant, there is only a small window with egg and sperm are in the right spot to come together. However there has got to be more to it, because children all over the world were conceived in the same moment Harry was, it is doubtful that they will all go on to be star born children.. Or they are, but events keep them very ordinary as they grow to adults. So after meeting Malcolm, falling in love, seeing his good heart, she makes the first decision. Then she has to explain to him what she wants, he has to agree.. That is the second decision. Then why bring such a child into the world if you cannot keep it safe? They and the child will need lots of help, that too has to be planned, or there is no point to bring him into the world.. Who can she turn to that she can trust? Now that is the tricky part, her circle of "friends" who would be able to keep Harry safe and not use him for evil or their own aims is very small. She goes to Morgan, but while she can depend on his diligence, she also knows he can be persuaded and couldn't be trusted to keep the information from the Council. She goes to the Winter Court and strikes a bargain with Mab, Lea is appointed godmother, but what did she give up for this protection? It could be why Mab was so sure Harry would be her Knight one day, it was decided before he was born. Rashid, I think was in on it also, he hinted at that to Harry back in Cold Days, and he has saved Harry's bacon more than once as a Senior Council member.