Most of the potential gas causing veggies are supposed to be very strictly limited anyway due to not being "leafy greens"... of the leafy green veggies, the ones that are somewhat related to cabbage like kale and bok choy are ones to be a bit stingy with.
Just because you have one mild run-in with gas doesn't mean you need to cut those veggies out completely, mind you.
Gazzles gets gassy now and then (and got GI stasis from it the other day). I've been feeding her and Nala kale on a *very* regular basis since they were a few months old (for a good while it was the only leafy green Nala would eat) and occasionally feed bok choy... with kale, I give my girls 2/3 to a full bunch at a time usually (it dropped to 2/3 recently because I got a third rabbit that's housed separately; 1/3 goes to him) and Gazzles is a little piggy, so I know she eats some of Nala's share in addition to her own. In over a year of feeding generous handfuls of kale, Gaz has displayed pre-stasis symptoms ONE time (reduced appetite that was quickly restored with at-home remedies, eliminating the need for a vet trip) and has developed stasis only once (last Thursday). On a handful of occasions, she's had a normal appetite but still appeared to feel a smidge gassy so I've given her a dose of simethicone just in case. Most of the time, she inhales her kale and does just fine with it.
What I'm getting at is that every bunny is different and when it comes to bunnies being prone to gas, the degree to which they're sensitive to gas causing foods runs the gamut. Some can't have those foods at ALL... others, like Gaz, are usually fine with them but every once in a while get a bit of gas. If your bunny is only mildly prone to gas, you can continue to feed them in reasonable amounts - just keep simethicone on hand, moderate portion sizes to whatever size she seems to tolerate well and be aware of the early warning signs of gas so that (like you did this time) you can administer simethicone promptly and prevent the gas from worsening to the point of becoming serious.
To figure out how sensitive she is, I'd treat it like introducing veggies for the first time - if you want to feed kale or bok choy, feed a very small amount. If you do that a few times without issue, then give a slightly larger portion the next few times. Should you encounter any gas issues, cut back to the last portion size that was reliably tolerated.
