3.5 year old will only let me or grandma shower her

I know it’s my responsibility but sometimes I need some help. My daughter is almost 4 and she cries and cries when her dad or big sister shower her. I have sat there and watched them shower her without them knowing just to see why she doesn’t like it and there’s nothing that they do different than I would. Every time dad or sister say it’s time to shower she starts crying and says I want mommy to do it . Or if she’s at my moms house she will let her shower her but it’s always a huge deal when I need someone else to do it. I’ve asked her why and she sometimes says sister puts the water too hot or too cold and I check the water and it’s fine and I tell her the water is fine and she says ok but keeps crying .Anybody else? Why does she do this 😑