Girls, Can I get a coworker a gift to celebrate her sobriety if she is in a relationship?

She used to be a heroin addict and quit and her last day at the methadone clinic is soon and I want to get her a small gift because it is a big milestone but I don't know if I'm crossing any boundaries

Girls, Can I get a coworker a gift to celebrate her sobriety if she is in a relationship?
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