Answer:
Depending on the error message which Alice get but what could have gone wrong is perhaps firewall issue.
Step-by-step explanation:
There are lots of probable reason why Alice could not access her files during the weekend but below are some common reasons:
Firewall issue: Maybe Alice has her firewall turned on unknowingly as it is known that firewall do block such types of connection except it is explicitly allowed from the firewall settings. Another issue might be that, Alice ISP uses firewall.
FTP programs Setting: Perhaps there is a settings which Alice has not activated in the FTP program that she is using.