Does what happened in the past affect a girl's and her family's reputation, and what should she do when she feels despair about her cover being exposed?

It is advisable to completely disregard the whispers of Satan, which aim to instill sadness. For whoever fears Allah, He will suffice them. One must resort to Allah, have a good opinion of Him, and frequently supplicate that Allah conceal one's faults in this world and the hereafter. And whatever sin Allah has concealed, one should praise Him for that and conceal oneself, refraining from speaking about it.