As for the choice of spells themselves, I was reading this wonderfully useful "How to" for character creation: https://forum.atlas-games.com/t/a-how-to-of-magi-chargen-for-the-boggled/1102/1
And there is a list!
o Combat- one target, bigger punch
o Combat- area effect, no aiming needed
o Defense
o Escape
o Gather Info
o Travel- long distance
o Travel- comfort/warmth/survival
o Gather Vis
So I really just went down it and ticked them off as I went. One single attack spell, one group attack spell. The wall of stone is good for running away, or defending, or just being useful. I mean, you can do a lot with a chunk of stone that large. A spell for intelligence gathering after a fashion (missing artefact)...I wanted the one that lets me talk to stone, but that's a level 30 spell and I can't cast that! One for long distance travel (Palanquin). One for not being stabbed (Queen). Unseen Porter and Supple Iron are just utility spells with endless uses. Blink Step because teleportation is super cool, and super handy and I can just about cast it thanks to my rego. Equanimity because...Frederika gets mad. And she was probably forced to learn this one so she'd stop braking things quite so readily.
Then I ran out of points. Well, ok, I have two spell levels left. But I have no idea how to spend them.
But that's ok! Because she's still good at spontaneous magic, and I figured that would pick up the slack. A lot of the spells she knows are spells she can't rely on her ceremonial casting to cover - either because her arts just aren't high enough, or not casting them on the spot will get her killed because some people can't wait two minutes for her to finish casting!