Ro's appearance here is actually kinda ironic given her status in the novelverse.
To wit: Ro's Maquis cell was one that lasted into the Dominion War and carried out guerilla raids on the Dominion. After the war, they were granted amnesty, and Ro eventually joined the Bajoran Militia. She was assigned to DS9 as their new security chief (replacing Odo; she arrived a few months after "What You Leave Behind").
When Bajor joined the Federation (and the militia got rolled into Starfleet), Ro was planning to resign her commission and retire, but she got a letter
from Captain Picard urging her to give Starfleet another chance (i.e., the complete
reverse of Jean-Luc's position here, that
she failed
them). She did so, ending up as a commander, and was eventually promoted to Captain and placed in charge of DS9 when Captain Kira retired.
She also dated Quark on-and-off for a while.