I checked her activity and she's only logged less than ten minutes since the beginning of the course. Yikes!
Yikes, indeed!
As bone_gal mentioned, it's vitally important to have very clear communication guidelines about situations like these. Students just aren't prepared for online classes with deadlines. They think "online" means "self-paced and easy".
Incidentally, I'd probably call her on her log in time. That is, if she even follows up.