The forward vis from a Stearman is near zero. Extreme caution is required when taxiing this aircraft type. Especially in congested areas, you need to taxi relatively slow and S-turn. If there is a distraction at hand such as receiving a transponder code, stop, enter the code and then proceed.
Prior to proceeding, consider adding some power with one brake applied to pivot a bit allowing you to see what was ahead of you prior to pivoting, in order to be sure that the area ahead of you is clear. Then you can pivot back and proceed forward.
This lady is nowhere near the first Stearman pilot to taxi into something(I know one who has), and is likely not the last.