Hi, I just googled for Vista MSN issues. Since I don't know how your daughter uses MSN, here's a few sites I found, maybe one will help. One of these refers to a user that uses MSN dial up client to get to the internet.
Anyway, here's some:
If none of those sites help her, please provide some more details/information so I or someone else can help further. If you google "Vista freezes", you will be overwhelmed with sites to read.