What gift should I give in this situation?

Over the years I have become friendly with the two women who clean our office after-hours. I am one of the few people who works late, and one of the only people who speaks spanish, so I am one of the only people at work who knows them. They have worked in our office for almost 10 years but I don’t think almost anyone else even knows their names.

I have learned a bit about some of the difficulties they deal with, including working very long hours in multiple jobs. One of the women is about to go back to her home country to see her family for the first time in many years and she is very excited for the trip.

I wanted to buy her something simple for her trip. I don’t want to give her money because I think it would create a strange power dynamic. Trying to think of a small gesture so she knows all of her hard work is appreciated.

Thoughts?