This happened to a really talented Indian engineer on my team who was dependent on the company for her visa. Her work was stellar and she often worked 60+ hours

This happened to a really talented Indian engineer on my team who was dependent on the company for her visa. Her work was stellar and she often worked 60+ hours when the rest of the team worked 40-50 regularly. Our manager was kind of a jerk who wasn't particularly fond of showing appreciation for ones work. Eventually I and several other people went to a new manager who was also Indian (I'm white, fwiw). She moved over a short time later and was promoted quickly. Obviously not everyone has this option so I would suggest you do everything you can to highlight your coworker's contributions. Thank them for their help in standup, highlight their work in your 1-1s with your manager and tell them that you think this person deserves a raise or promotion. Tell higher ups that you think this person has been doing really well, etc. One thing that can be helpful is showing how much work that person did. In this case she compiled the numbers of how many stories, incidents and defects she closed relative to other people on her team, which showed her at almost double the average. Of course this is an imperfect metric and can be gamed, but having data is valuable. Good luck