Hi TG
I can't speak for all email accounts, but is she on Hotmail by any chance? I know you have discounted the 'Block Sender' possibility, but there is also the various levels of filters to consider. On Hotmail it reads something like this;
"Choose your Junk Mail Filter level:
Default (obvious junk mail is caught)
Enhanced (most junk mail is caught)
Exclusive (you will only receive e-mail from addresses appearing in your Contacts or safe list, service announcements from Hotmail, and e-mail that you have consented to receive from MSN)
Note: At Enhanced and Exclusive levels, wanted messages are occasionally identified as junk mail. Check your Junk Mail folder regularly to make sure wanted e-mail has not been moved there.
Choose what to do with your junk mail:
Delete junk mail immediately
Junk mail messages are deleted without ever being delivered to your Junk Mail folder.
Deliver to Junk Mail folder and delete later
Junk mail messages are delivered to your Junk Mail folder so that you can review them. Note: MSN empties the Junk Mail folder regularly to keep the folder size small".
It could be that if she has something like this, she may have it set to 'Exlcusive', combined with possibly immediate deletion of junk mail?. I would have assumed you would already be in her list of Contacts, but hey, what do I know?
bug