Many times mothers do not know how to respond to a question like the one you asked, for example my grandmother would have answered me like your mother did or if she had explained something to me it would have been a very dry answer, but my mother is different, she explained and still does because she has always been a faithful believer that there are things that must be known first at home, she even prepared me for when I got my first period. A hug and greetings from Venezuela