ashton taylor has slammed belle gibson over false claims she had cancer .
the 21-year-old , from perth , was among the tens of thousands who purchased the popular app the whole pantry .
she has had 15 brain operations as she battles a rare condition .
gibson admitted she never had a terminal brain cancer .
miss taylor said she felt tricked after believing gibson 's cancer story .
but the student said an apology will not make up for what she has caused .