They are generally relatively small, beautiful, tasteful, and “artsy”.
Additionally, they may have some sentimental value/meaning to the person getting them, perhaps in terms of a lost loved one or a favorite vacation spot, for example.
Possible subject matter is, given the intrinsic personal and emotional motivations, predictably varied: butterflies, sleeping kittens, a breaching whale, or perhaps literally anything else of particular significance.
Clean black lines are most often utilized to render these images. They are not garish or meant to be unsettling in any way, and there is a very apparent emphasis on beauty as the overwhelming priority.
Female tattoos are not “trashy”, despite what your “nana” insists every single time she sees you. As long you don’t go “full Post Malone” and pile up the face “tats”, she will probably stick to just haranguing you, but not outright disowning you, fingers crossed.
In fact, tattoos can convey real beauty and genuine sentiment, and aesthetic tattoos, in particular, are a great vehicle for just that purpose.
For example, consider the idea of aesthetically-rendered butterflies. The composition could include five butterflies of various sizes placed in a loosely circular pattern along the forearm.
Crisp black lines would create the bodies, while the wings, frail and powdery to the touch, could be rendered via somewhat thinner lines as well as implied ones.
Light shading as well as some sparsely applied soft pinks and yellows for the wings would complete the look, except for a more brightly colored flower around which they are congregating.
The next time you see her, tell your “nana” that she is the flower around which the family/butterflies revolve, then watch her melt. Free at last!