"Am I being unreasonable to think people should just call her by the name her parents use and not make names up?" she asked.
"It really bloody irritates me."
Several Mumsnet users believe the mother is overreacting as it is an abbreviation rather than a completely different name.
"Calling her by a clear diminutive of her actual name, eg Meg, is just people being friendly, and could be a term of endearment. So yes, chill for goodness sake," someone said.
"Can remember the Hyacinth Bucket-like mother of a school friend who always made a point of referring to her daughter as 'Elizabeth' and pretended not to know who our mate Lizzie was! Uptight and ridiculous," someone else said.
"Meg as a diminutive for Megan is hardly making names up. If you pick a name with an obvious shortening then I'm afraid you have to expect that people will probably use it. Your DD may also use it when she's older," another parent added.
However, not everyone agreed. "Megan is a lovely name. My son's name gets shortened and it's annoying so I get it," someone said.