AITA for asking my cousin the bride to put a deposit down before I book vendors for her?

r/

I’m 27F, she’s 26F. She asked me to be a bridesmaid and “plan everything” since I’m organized. Now she wants me to book hair, makeup, and the photographer on my card and “we’ll sort it later.” I told her I need a deposit first and she blew up, saying I don’t trust her.

I’ve already driven her to appointments and paid for a lot of smaller stuff. This feels sketch. Is it normal to ask for deposits, or am I being stingy? How do you handle this without blowing up the wedding?