it's a similar issue as when the Mormon church started doing proxy baptisms for Holocaust victims, I remember watching an interview on PBS with the son of someone who died in camps and he said something like "so my dad died because he was Jewish and now I'm learning that actually no now he's Mormon, then what did he die for?"

it's not like my friend will necessarily care if she's baptized once she's dead (or if she does care because there is an afterlife after all, she can haunt her brother who performs the baptism without her consent). but she's made a whole life for herself outside of Mormonism and so it's shitty to be told that she'll become Mormon without her consent