I understand your frustration I'm the only person in my family who accepts evolution and it is in my experience that debating creationism is pointless, but if you truly want to my advice would be show her ways that creationism is impossible, like ask how many animals were on the ark. If she follows Answers in Genesis she will probably say around 1,000-2,000 "kinds". In order for 2000 species to evolve into the 8,700,000 we have today in only 4,000 years there would need to around 6 new species everyday. I would say don't try to show creationism is wrong scientifically, but logically, then she won't be able to that is a lie.