Check the groups belonging to yourself and your wife.
~$ groups yerwifesname
yerwifesname : users lp audio video cdrom plugdev power
Compare it with your groups.
If there's no difference, check the preferred audio device in kde (system settings, multimedia).
I assume if you've got frozen bubbles working, that means you installed those SDL packages. Did you use the builds from slackbuilds? Are you on slack 13 or 12.2, etc?
When I launch frozen-bubbles, the console reports;
[SDL Init] [Graphics..........] [Sound Init] Ready.
Any errors with your console here?