"Is Merope Gaunt a squib?'

Honestly people, read the text thoroughly! No, she was not a squib! Due to her father's constant insults, Meropre's abilities were not strong, but she still possesed magical ability. Some confuse Merope Gaunt with Ariana Dumbledore, but she was not a squib, either. She was believed to be, but was actually mentally unstable. Merope Gaunt was a pureblood witch.