You can categorize Argentine Tango basics to Pivot-based moves and Walking-based moves.
Pivot-based moves include pivot (literally), ochos (step+pivot), giro, and embellishments like boleo (pivot+ decoration use of your leg) and foot play (tap, ankle flick, etc. "gesture" moves. Subtle but nice). As Pivot-based moves use rotation around your axis, the motions tend to be circular or curvy. Also, Pivot-based moves can quickly change the angle of you and your partner's bodies. The quick changes in appearance can defy viewers' predictions and overwhelm spectators' brain processing speed, leading the dance looks more impressive (maybe).
Pivot occurs on one spot. In a given moment, you are staying there, instead of traveling far. In a milonga with crowded floor, people tend to use more of pivot-based moves.
Walking-based moves are more directional. By walking, you reach from point A to B. Walking means that you'll shift your axis from one to another. You can travel further and faster than pivot-based moves by taking big strides. You need to stretch your stride for proper looks.
As they are different types of moves, people tend to do better at one than another. In a milonga, you can observe your potential partner, and figure out his/her preference or strength/weakness in the techniques.
She may be good at pivot-based embellishments like foot plays, which occur within a foot distance from her axis. But she may not be used to take a big stride, and collapse if led to do it.
If it is the case, just use more of pivot-based moves. Do what she can do better.
Trying to correct technical issues during a social dance is not a good idea. They don't want to be corrected. They are there to have fun. And it is the same here, of course.
Only when it is for a stage dance in which appearances and presentation of techniques matter, and only when you are an instructor (i.e., they are paying to listen to you), or otherwise in a position to be heard, it makes sense to attempt correction.
Milongas and other dance parties are restarting around here. Got to remember particulars in social dance.
