Presumably, the girl that Ingrid and Henry encounter is Alba, though this past version of Henry wouldn’t yet know that he has a daughter. Alba’s ability to time travel seems to help her process her grief, allowing her to build more memories with her father even if she knows he won’t be able to make new ones with him in the future, after he has died. As fellow time travelers, Alba and Henry can share a “here and now” that transcends time and space. This is perhaps why it’s healthy and productive for Alba to visit her father in other times but unhealthy for Henry to visit Clare after his death.