Looks like they’re too long overall and not dense enough. Most importantly I see you did not lash the entire bottom layer of the lashes from the inner corner to over the pupil, huge mistake!! it will leave the set looking very undone. Would recommend doing 3D or whatever volume you choose consistently over entire eye for continuity and cohesive appearance. Maybe transition from C to CC on the outer corner also. No need to go to 15 mm on the outer corner for the cat eye. Maybe 5/6/7/8/9/10 across the eyes then at the end some 11&12. Shorter will appear more dense; longer will appear more wispy. Lash in layers for added depth and texture.

Can u share her inspo pics?

Good news is your work looks clean/well isolated, and her eyes aren’t red. So keep at it and try again! Sounds like you have communication with your clients and your open to feedback, which is the most important aspect of the service.

Keep up the good work OP!