Having period twice a month?

hey, my gf have her period twice a month, does this affect her health?what are the benefits of having period twice a month if any? why does this happen?

Popular: Is this a good breakfast when exercising? Does anybody want to be my friend? I'm 18 year old male.? What are the healthy food like carbs fats proteins all healthy foods list? Why is amurica fat? Why is having sex drive a part of being healthy?
More: I'm feeling depressed. Let me begin, I come from a big family. Over 10 people in 1 household...? Why am I talking to you? Are tapeworms contagious between people? Injured by a fast flying boomer-rang, can i take legal action? Blood clots or Misscarrying??