She brought him back

When Makkah fell, a general amnesty was given, with a short list of exceptions. Ikrimah, Umm Hakim's husband, was on that list and knew it. He made for the coast, looking for a boat.

Umm Hakim accepted Islam. She then asked for an amnesty for him, and it was given to her.

She did not send anyone to deliver it. She went herself, and caught up with him at the water's edge, and told him she had come from the best of people with safety for him.

He did not believe her at first. She persuaded him, and they turned back together — travelling the whole way with him still not yet a Muslim, which the sources record plainly rather than smoothing over.

When they reached Madinah, the Prophet ﷺ is reported to have stood to greet him, and to have told those present not to abuse Ikrimah's dead father in front of him, because it reaches the living rather than the dead. Ikrimah accepted Islam there.

The amnesty was hers to obtain and the journey was hers to make. Both mattered: without the first he had no safety to come back to, and without the second there was no one to tell him it existed.