I think it is also this lovely thing called puberty! Their emotions are everywhere and they don't know what is going on within themselves.
My 11 year old is going through this stuff now and it is not a fun rollercoaster for her. Michele's daughter is working through a lot of stuff. Her Dad isn't there, you are, she likes you but what if you leave too??? She is afraid to get attached and have her world crumble down again.
Talk to her and acknowledge what she is feeling. These fears are very real to her. Let her know that she can come and talk to you anytime if you are comfortable with that. this isn't just a phase in regards to these fears.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory