This report shows someone got down there with her to help her back up to the platform.

Edit - video seems to be missing from page or blanked out.

Here are a couple twitter pages (one mostly French comments, the other English, not that the comments are any big deal)

https://twitter.com/Bruxelles_City/status/1482106862204076038

https://twitter.com/Bruxelles_City/status/1482102138083885061