I'm trying to come in carefully here, but I wanted to untangle a few things
1) The CAR does not require that you fire on the enemy, only that you be involved in direct combat. Being shot at is sufficient.
2) With two AEGIS ships around, 100% one of them was AW. The description of Indy's role does not sound like AW anyway, but rather AQ or AZ, the command and control warfare coordinator or whatever they are calling the role now. Basically the electronic warfare boss. An LCS with some EW containers aboard would make sense for the job.
3) I can't find the specific quote that says Indy made 2 intercepts. But related to #2, if she was doing EW stuff, there are lots of soft-kill techniques that could down a drone without expending actual ordnance. The Marines downed an Iranian drone with EW a couple of years ago, using a mobile jammer parked on the flight deck of an amphib, for example. And of course, Ukraine has dropped a lot of Russian Shahed drones using EW techniques.