First off, i hope your Katie was CC'd at 50, that's the general rule. Always CC at 50. Just putting the knowledge there in case you didn't know.

Anyhow, let's have a look at your team.
Since you have CC'd Katie i would recommend getting a healer and archer up. Bashira is your best archer choice and for a healer i'd go with Iris.

Once those two are CC'd you'll want to look at getting Cloris, Soma/Daniela, Barbastroff/Mehlis, Bernice and Alyssa up to CC. Not saying any particular order, it really depends on what you seem to have problems with at the time. As for Barbie vs Mehlis, Mehlis will have higher attack and situational utility, while Barbie will have a bit less attack but a bigger AoE, so pick whichever you want. Do mind that Barbie might be more difficult to get trust with since he's a male. And for Soma vs Daniela, Daniela is better attack-wise but Soma obviously starts with a fair deal of affection, and those items do not grow on trees when you start out the game.

As for Minerva - She's a nice black unit, but not the most useful in the start of the game. She'll be more useful later though. Her assassinate is great too though, but it works on all levels so do not raise her first, wait until you have a good core of the above mentioned units.