got a short email. but at least a email.

i got a short email from her today but at least it was a email right?? so i am thankful for that. but in how she was typing things out it seems like shes being so distant. i hope its nothing that i did to make her distant with me. :-/  i hope not. cuz id feel bad if it was something i did. she said she was thinking about me in the short email so that was a good sign right?? but why do i still think she is acting so distant??