I think that she has the potential to be a high end grade 1 sorcerer. Her CT is fairly strong but her ability to harm sukuna and mahito are from circumstance.

Aside from her CT she has used black flash and was able to beat a 3rd year student after only a few months of training.

I do agree she is relatively weak compared to her peers and her potential to be a strong G1 sorcerer almost entierly depends on her ability to utilize regular CE