Okay, I’d like some input.

Most of the forms talk about the thief/sorcerer combination as something hard to play. I suspect that it is due to mechanics. 

I am wondering if I should have her as a Magic Initiate (feat) and later pickup the ritual caster. The dmg talks about feats being able to be given out by deities as rewards instead of treasure.

That would let her focus on being primarily a thief.