msn should work ok with IE, it does for me.
i am guessing but it is probably something to do with her security settings in IE, check they are the same as yours.
has she got a firewall running which may block the text side of msn?
sorry dont really know this one, just having a wild stab.
good luck anyway
ps. have you tried the Help (FAQ) on msn, see if there is anything there.