OMG, Egeria!!!! I cant even IMAGINE the conflicting feelings you are having right now!
If the first conversation you have with her is NOT awkward, I would be surprised...I mean, when you meet a new person, you know nothing, there is nothing preassumed. If you were to meet a person whom you knew something about and those somethings were all POSITIVE (let's say, a friend's new beau that she's said is really GOOD for her) then that gives you lots of GOOD things to talk about. The things you know about this girl all come from sad or bad experiences. SO....sure, it will be awkward.
BUT....you will get THAT part out of the way, and then you may find that you have that to bind you together! When you are done talking about all that "stuff" you will get to know her as a separate person. Then, she will be like any other new person you meet, except that you will know you have some experience in common.
TRY to think of her as just someone with whom you shared a childhood experience. I mean, you were all VERY little when these things took place. None of you had any control. But, those experiences will give you something in common and something to build on.
You keep us posted, sweetie....and DONT chicken out on that call! You have wondered about her over these last 10 years...
HUGS to you until then!!!