Twice a week is a good amount. Kits don't need different dust bath times/amounts than adults. As for holding her, I would hold off on that. Try talking to her and then gradually start putting your hands in the cage and letting her jump on them and smell you. After she's ok with jumping on you, you can try lifting her up. If she runs away, I wouldn't try it again for the day.
All chins are different. I currently have a 4 month old kit (who I had since she was 8 weeks old) who still kacks at me sometimes when I pet her. I also have an adopted two year old who will sit in your arms all day (as long as there is playtime and treats involved!). Just be patient! The last thing you want to do is stress her.