What a great hobby to have! If your grandma is passionate about model railroading, there are plenty of gift options that can help her indulge in this wonderful pastime.
One option could be a new model train set, if she doesn't already have one. There are plenty of great models that are available, and you can select a set that appeals to her interests, whether that be a specific era or region.
Another option could be a new track extension so she can expand her current set. This will likely get her excited about designing her own custom layout, and give her more space to play with.
If your grandma already has a model train set, maybe consider getting her an accessory or two. These range from scenery building supplies to miniature figurines, to lighting fixtures to more accurately mimic different times of day.
For a more personal touch, you may want to consider creating a photo album or scrapbook of your grandma's past model railroading projects or memories, which she can look back on and reminisce about her projects throughout the years.
Lastly, you might want to consider getting her some new reading material. There are plenty of model railroading magazines available, and a subscription to these would give her new and exciting ideas for her layouts throughout the year, even after the holiday season is over.
Whatever you choose, remember that it's the thought that counts, and any gesture that shows you care about her hobbies will be appreciated.
Or you can get her a star map with an important date you share.
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By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.