Fine, I'll address it.
We don't know the limitations of Starlight's power. Her power is described on the wiki as follows:
/// Electricity Absorption: Annie's trademark power is that she can absorb the
ambient electricity from around herself in order to fuel her powers. This allows her to blackout a small area before releasing the held energy as focused blasts of light. Currently there is no limit which has been established for how much power Annie can safely absorb or how long she can contain it within.
[1] She has shown to have some degree of control over said ambient electricity as she is shown to use it for the sole purpose of disrupting electronic devices such as cracking an LCD screen on purpose. ///
We don't if there's a limit or a form to her ability to absorb energy. The wiki describes her power as that to absorb ambient energy, that is, the energy running through ordinary electronic devices, power lines, etc. Let's compare the voltage of a lightning bolt to that of a high transmission line.
/// According to the National Severe Storm Laboratory, a single lightning bolt can have
100 million to 1 billion volts, and it contains billions of watts, depending on whether it is positive lightning or negative lightning. ///
/// Transmission lines carry high voltage electricity,
typically at 345,000 volts, over long distances between the power generation plant and customers. In some cases, a large industrial customer may receive electricity directly from overhead transmission lines. ///
The difference between the power of AMBIENT ENERGY and a LIGHTNING BOLT is staggering. Just because Starlight can absorb the juice from your walkman's batteries doesn't mean she can absorb a lightning bolt which is several million times more powerful. Even if she could theoretically absorb a lightning bolt, it would no doubt take lots of practice to reach that level of physical performance. Practice which she, as a relative newcomer, does not have.
In other words, you mong, it makes perfect sense for the newbie energy absorber to get overpowered by the experienced lightning shooter.