Long hair, healthy skin, and a physically fit body are the most obvious indicators of overall physical/mental health and vitality. They're also an aesthetic compliment to ones fertility/virility. Whether married or single, when a woman cuts their hair short similar to what's depicted in the meme, they do so as a threat warning. Much like poisonous animals with neon colored skin, it's to warn other people from approaching them. Most women who do this are in the midst of psychiatric distress. They're best avoided and referred to trained professionals to engage.