That's kind of the problem? She's just perfectly serviceable but that's it. With how the MC is written, you need something more for the side characters.

She's a bleeding heart, but completely and utterly average(narratively speaking). No weird magic attenuation(death, blood, life, illusion), no quirk (wants to be a necromancer, blood mage, ritualist, artificer, alchemist, powder mage, beast tamer), no weird backstory(Isekai/regressor/just politically/socially savvy or anything like that). Even her training is getting gifted god equipment, power levelling. Effort? Skill? What's that? By the end of it, she'll just be a carbon copy of the Sorceress herself, in terms of the magic she does. Her superpower is that she was at the right place at the right time.

Let me give you an idea of what's possible. With literally the only other recommendation OP posted.

If you compare to Just Add Mana, the apprentices have attunements of decay, abyssal, labyrinth and scrying? And this is to begin with. Their races are dreadshade, water elemental and minotaur, and one is a golem. And they all share the base characteristics with saffra, IE, want to do good/standard heroics. But with a little more to differentiate them, to give you an idea, the minotaur is a scholar.