Her first concern is that you physically appear as you depict yourself on whatever online platform she met you on, should it be the case that she has never met you in person.
If you matched with her on a dating site for example, the first thing she looks for on your social media is to verify your physical appearance.
As a potential date, the last thing she wants to do is show up on a date only to be disappointed by your physical appearance.
In the event this is a woman who has already met you in real life in some capacity or is fully aware of what you look like, the first thing she looks for on your social media centers around your photos too.
A history of sporadic posts without much of any substance that are far in between is indicative of someone who doesn’t care much for posting on social media.