Security blanket with my 4 year old

Ka

My daughter got attached to this big blanket she has it with her 24/7 I’m wanting to start weaning her off it as she starts senior kindy class this year and they don’t allow the kids to bring those things so that they are ready for big school, what’s the first step to do this? Do I just go cold turkey and throw it in the bin? I can’t even wash it without her having a tantrum till it’s in her hands again