She has probably been told she is detached. What the person means: she was thinking about the pattern rather than the moment, the structure rather than the individual instance, what this situation would look like from outside the current proximity. Not detachment in the sense of not caring. A different orientation of attention, outward and structural rather than inward and immediate.
Fixed air. Uranus-ruled. The air gives a mental orientation, a commitment to truth over sentiment. The fixed quality makes that commitment permanent, stubborn in ways that surprise people who expected air to be more flexible. Once she has arrived at a position through her own thinking, she holds it.
She thinks sideways from everyone else. Not contrarianism. A genuine tendency to see the question from an angle the group has not tried yet. Uranus rules the place where the usual logic breaks down and something new becomes visible.
She cares about things that do not directly affect her: the conditions of people she does not know, the systems that structure lives with less power, the future as a category of concern. For Aquarius, this is a specific form of love. She is often slightly ahead of the curve. The curve catches up.
In relationships she needs intellectual engagement and genuine respect for her autonomy. A relationship too small for her actual thinking life will not hold her.
The growth edge: she can be genuinely committed to humanity in the abstract while leaving the specific person in front of her feeling unseen.
The idea becoming more real than the person — the principle more important than the individual — that is the edge to watch.
Her commitment to what is actually true, regardless of what is currently accepted, is one of the mechanisms by which things change. Not aloofness. Courage.