What should a girl who committed the sin of speaking with a foreign man during her engagement period do to avoid being exposed, and is her repentance accepted despite her fear of exposure?

So long as you have repented to Allah with sincere repentance, fulfilling its conditions and solely for the sake of Allah, then have a good opinion of your Lord and trust that He will accept your repentance and pardon your misdeeds. Strive in supplicating Him, Glorified be He, to conceal you and not expose you. Rely upon Him, and have a good opinion of Him. We advise you to strive in drawing closer to Allah and to increase in performing good deeds, for indeed, good deeds efface evil deeds.