NetMeeting mystery

Apologies in advance if this question has been asked. I have searched for
the past hour without finding it. I am US based, using XP home; my daughter
is in the UK, using 98 (SE I think). I have NetMeeting links with other UK
users (but all are XP users) but am struggling connecting to my daughter on
98. She had NetMeeting set up on her PC for her by an 'expert' and we
estbalished an immediate connection while this person was there. When I
tried to connect again, two days later, I got a message saying her PC was
unable to accept NetMeeting calls. She swears nothing has been changed
although she did seem to have a different IP address the second time (but
using this still did not enable me to connect). She also 'confessed' to
swapping out the camera with a USB printer as she only has one USB socket
(and no hub) but swears she simply reinserted the camera connection. I am
behind a router on a home network using cable broadband so I only usually
connect from my end (without problemns with XP users). She just has a direct
cable broadband connection. I've been through all the NetMeeting settings
with her and everything seems in order - but I'm no expert. What am I
missing and how should I troubleshoot (the MS troubleshooting pages offer no
help at all for thsi problem)? Thanks in advance for any help.