Just in case someone is wondering,
you can make Crystalblaze have her kits in brambleclan instead of running away to the fair.
First, you have to discover her rogue realationship as a warrior. DON'T TELL BRAMBLESTAR!!!
Then, become leader and talk to her. She will say:
Now that you are leader, and you know that I have a rogue realationship, you have all the power to exile me from the clan for my betrayal. Sunfall loves me, and I love him. I want to start a family together with him, but that would mean that I'm breaking the clan code.
She will also say that she doesn't expect you to forgive her.
After that, type in no. The question will be "should I exile Crystalblaze from brambleclan?"
I haven't tried to type in "yes" since I don't want to exile her.
I hope this is helpful!