Lizella,
makes sense to me that it would take some time for anyone to believe this, get used to it. there would likely need to be some process (don't you love that word???).
there was for you and me, after all.
took me over three decades to really get it; how could i expect someone else who thinks he/she KNOWS me to believe this at the drop of a hat?
it's like saying:" you're my best friend, so you are justified in thinking you know me, that i've told you the biggies in my life, about myself. well guess what? i've had this huge huge secret, and i'm not who you think i am! waddayamean you don't believe me???huh?"
give her some time. you're likely not the only one feeling lonely right now. it might well look to her like she never knew you and has now lost a best friend...
if you really care about each other, you'll be able to talk more. in a bit of time.