Missing WordPress site with BigCartel

Alright, I am developing a blog site for a friend who is also selling jewerly. We installed the blog under kiwiavenue.com/blog. However, when she activated a BigCartel site under kiwiavenue.com, the blog disappeared. I cannot get into the wp-admin screen or the wp backend. The directory still appears in the file directory on the host. It seems to me that somehow Big Cartel is running a script that is overwriting the wordpress install. Please help! I’ve never run into this problem before.