Having lost both a sister at 22 and my Dad ... Holidays are very rough along with anniversaries of birthdays and the day the losted one died. It brings up so many emotions and in a new relationship it might not be something you want to share right away. I would just give her some space, let her know you care and are there for her if she needs you but don't push. It may have just been too much too fast also... slow it down, if it's right , there's no need for rushing. SLow and easy .. build that friendship.
Good luck!
