my girlfriend is in a coma i have gaudianship of her 12 year old daughter is there anyway i can get legal right to find out about my girlfriends healt

There is likely no easy way to get that information.  Given your status as the girl's caregiver, you could start a custody action to get custody of her.  You would need to notify whoever is your girlfriend's decision maker (usually a Power of Attorney).  I'm certain the state of your girlfriend's health would be a topic the court would want to know about in making their decision.  You should really consult with a family law attorney to discuss the details of your complex case.