She is very superstitious about this kind of claim.
Tips
culture
In Chinese culture, many traditional beliefs walk the line between custom and 迷信 - like avoiding the number 4 (sounds like 死, death) or giving red envelopes for luck. The government officially discourages 迷信 but many folk practices persist.
usage
迷信 can be used as both a noun ('superstition') and a verb ('to be superstitious about'). As a verb it often takes 对...迷信.
