.. fear of the unknown, If I were her not so sure I would be looking forward to it, having the A and STD 'out there'
Retrouaville isn't about spilling all of your guts and revealing all of the M's dirty laundry for all sundry to see the gory details. From what I understand, the retreat's purpose is to give couples tools so they can improve their communication and practice radical honesty.
Maybe others who have actually experienced it can chime in here and help out.