a. No, the whole idea of waifus is them being fictional, lemme quote urban dictionary here:5
waifu
Japanese for "wife". Outside of Japan, it is seldom used by anyone but weeaboos to display their unhealthy attraction for f̳i̳c̳t̳i̳o̳n̳a̳l̳ anime characters.
b. We are talking about her because she exists in a fictional world separated from our reality by a magical border.
c.J-U-N-K
d.You could be just some advanced AI, for all i know.