Is my girlfriend addicted to gaming?

Ive been living with my girlfriend for about 5 months now. Shes always played games, mainly like League of Legends, World or Warcraft, Minecraft and more recently Dota. She probably spends between 8 and 14 hours on games a day. I work quite a lot so when i come home i would like to actually spend time with her. I'm a really sociable person but I've found myself getting bored with nothing to do because shes always preoccupied. she plays it over night and vary rarely comes to bed with me, she usually creeps into bed around 3-7am then when i get up she stays in bed. I've mentioned it to her a bit, how should i breach the subject? Anyone in the same position?

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