I have double checked that this email address are not on my junk or blocked list and I have added their address to my safe list with no luck. She do can receive emails sent from me, but I can't receive them from her even if they reply to an email I have just sent. Please advise as soon as possible.

@ wdd

I suggest you check your account's filtering settings as these may contribute to your issue. Please see the following solution articles for your guidance:

Not receiving e-mail from contacts
http://windowslivehelp.com/solutions/settings/archive/2009/02/18/not-receiving-e-mail-from-contacts.aspx

How to set or change reply address
http://windowslivehelp.com/solutions/settings/archive/2009/03/03/how-to-set-or-change-reply-address.aspx