Sometimes I like to think about the fact Stratt has no idea that Grace survived on Erid. All she knows from the videos is he's going to save the Eridians, but she knows the food won't last, and she doesn't know (just like Grace at the time) that they'll eventually synthesise food he can eat.
As far as she knows, he got to Erid and died shortly after.
So to see MANY years later as she's a very old woman on her death bed, a lone newly built beetle arrive, made of the same xenonite her Grace figurine is made of that has sat on her bedside table ever since it arrived in the original beetles. To see a video file inside of Grace, scarred, stick thin, hunched through the heavy gravity, missing teeth from his scurvy...and with the biggest, happiest grin on his face as he tells her about his life on Erid.
She thought she'd found peace before when she watched those original video files, Grace smiling that she was right, and that all her emotional sacrifice to get the job done to get him out there was worth it because the Earth was saved...yeah, no. It was peace now. That toothy, excitable grin, that worn and threadbare fox cardigan, those stupid glasses still hanging off his face...alive.
Out there, living his best life, and alive.
Now she could die at peace.