I remember watching Goodbye Lenin, where the father defects while on a business trip and the wife faces a difficult interview where she's accused of knowing his plans. She convinces them of her ignorance, but clearly is afraid of what could happen otherwise. What would have been the potential consequences if she'd been less than convincing?
It was illegal to leave the GDR without a special permit, which also stated how and when you had to return. If you failed to do so, you risked criminal prosecution according to § 213 StGB-DDR, up to 5 years in prison (extended to 8 years in 1977). This includes attempts to flee, thus she could face anything from a fine to 8 years in prison for being accomplice in an attempt to flee.
If the authorities assumed that she organized (or helped to organize) her husbands escape, she could also be persecuted according to § 105 StGB-DDR, in which case she could face between 2 and 15 years in prison (later extended to lifelong prison).
Sources: § 105. Staatsfeindlicher Menschenhandel § 213. Ungesetzlicher Grenzübertritt Strafgesetzbuch der Deutschen Demokratischen Republik (StGB) vom 12. Januar 1968 in der Fassung vom 7. April 1977.
These are only the direct criminal persecutions though. If she had known about the attempt, even if she were only likely fined, she would have risked to be deprived of her (future) children's custody or be forced to give their children up for adoption.
Source: Marie-Luise Warnecke: Zwangsadoptionen in der DDR, Berliner Wissenschaftsverlag, Berlin 2009
Furthermore, she and potential children (or other close relatives) risked occupational bans. In that case, she would only be allowed to work in specifically permitted jobs, which carried the risk of being prosecuted according to § 249 StGB-DDR, which could be punished with up to 5 years in prison.
Access to higher education for her and her close family could also be limited or completely denied.
Source: Danuta Kneipp: Berufsverbote in der DDR? Zur Praxis politisch motivierter beruflicher Ausgrenzung in Ost-Berlin in den 70er und 80er Jahren. in: Potsdamer Bulletin für Zeithistorische Studien Nr. 36-37/2006, Seite 32 ff § 249. Gefährdung der öffentlichen Ordnung durch asoziales Verhalten. Strafgesetzbuch der Deutschen Demokratischen Republik (StGB) vom 12. Januar 1968 in der Fassung vom 7. April 1977.