you wont get the dialogue option to go to the void unless you let her capture you the first time you encounter her
I've been in the void at least 3 times, but the dialog still doesn't appear to me
Click several times until the dialog appears.
if thats the case then that means the very first time you encountered her you banished her, you needed to let her "kill" you first then after you capture her again you can find her in the house and speak to her and the option will come up
