yeah, the whole conversation was weird
"a violation"
"you're not ready"
my thoughts,
if MIB actually can give people the thing they most want, then the thing he gave Eloise in return for her help was the life of her son
she had killed her own son in the original timeline, so MIB relieved her of her guilt and suffering by promising her that if she helped him then he could fix it so that murder would never happen