My question involves employment and labor law for the state of: California

Hello,

I currently work at a club as a VIP waitress, and a new manager was hired.
She has scheduled herself on 90% of the Saturday shifts which are the only shifts worth working as far as tips are concerned.

I don't think she technically has the title of management, even though she is doing many managerial duties including creating the waitress schedule.

Are there any laws that protect employees against this kind of shift hogging? It is grossly unfair. Even though I only worked one Saturday a month, the tips counted as 40-60% of my income, and I am at a loss at what to do now that shift has been taken away.

Thank you for your time and your help.