OOC
It can be tough. What I found helpful is to try writing a whole phrase to describe what you think your character should be able to do, before coming up with a few words summery. It helps to make things clearer.
As for what Rita could do, you did mentioned she knew a 'witch', so it would make sense that she'd know a bit about 'real world' magical belief, like how a pentagram should be drawn and why, or even obscure systems like gematria. It doesn't mean you can cast spells, just that you know how people thought magic worked.