How can I get my toddler to stop freaking out about showers?p

My baby girl is almost 3 and HATES shower days ( no bathtub so always showers) she will scream and freak out like someone is hurting her…the idea of me washing her hair will cue a mega meltdown…she won’t calm down enough for me to walk her through putting her head back and letting me use the removable head…she just flailing and slipping and I’m scared one day she’s gonna slip and I won’t be able to catch her…then after the shower and drying of hair she’ll still freak out when I try and brush her hair…I’m almost and the point of cutting it all off into a pixie until she’s older and can loon after her own hair…I dred shower days, and hair days…help looking for tips trick advice…something to save my mental health…