An alb is the proper dress of any baptized person. She wasn’t wearing a cassock or stole.
Remember that any action properly done by a layperson can be done by a woman or a man.
The prayer service wasn’t a liturgy, so it was fine to have a lay person (man or woman) lead it. And it was fine for that person to wear an alb. EDIT: Even if the program said Liturgy of the Word, it wesn’t exactly the same thing as the LOW in Mass.
The reflection may have been something from a book or may have been something she wrote herself. That’s OK. This wasn’t a Mass, so it wasn’t a homily.
The statement “The Lord be with you” can be said by anyone; however, the response “And with your spirit” should only be said to an ordained person. “Amen” would have been better responses. But unless a different response was written into the program everyone was probably on autopilot which isn’t her fault.
I am very glad to hear that there were sufficient priests there to hear confession. Since none of us (including your son) were part of the planning for this event, we don’t know if the priests were asked to lead the service and they declined or exactly how everything was decided on.
Has your son never seen this woman before? She is likely the administrator of the chapel. (Again a job that perfectly appropriate for a lay person (man or woman) with the proper credentials to hold. One doesn’t have to be ordained to administer a parish or chapel or retreat center, etc.)