Welcome. If you are concerned about something, keeping it inside and not addressing it is likely to cause you problems. Communication is key to relationships. I suggest you speak to her and express your concern and explain your desire to be part of her life; which for you includes meeting her family/friends and knowing that her ex is aware that you are with her. My question to you is, what will you say/do if she tells you she doesn't want anyone to know right now?
All the best,