Well I cannot evalutate for level 3 before I have 5 Level C girls. But right now I only have Julia, Denise, Caroline and Denise. In the CareerBook app there are no girls to hire. So how do I get the fifth girl hired?
Take over districts.
Can't remember which one you need, but that's where most girls come from, so just take them all over. lol
CareerBook only gives you the 1st girl.
All others come from story progression, or are gained during\from a business or territory takeover.
To initiate takeovers, call a meeting (either from your phone, or exit your room & choose the meeting room. Either way will cost you 100 Energy), go to the District Map, select the appropriate District, select the respective Business & then you have two options to bring them down to 0.
Once you've brought them down to 0, you can start takeover proceedings from Settlements.
You'll need a decent amount of Lawyers. I currently have 55 & have not failed a takeover.
Obviously the more businesses you own, the more Managers you will need to recruit.