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Certainly any type of plant can cause vomiting and GI upset in cats. Did you see part of the leaf come back up, too?
I would hold off on offering any food for at least several hours--just let her GI system "rest". She is more likely to vomit again if you feed her right away, since her stomach is probably pretty inflammed right now. Do leave water out for her to drink.
In maybe 4 hours I would give her a small amount of canned food--you can mix in a little extra water if you are concerned about dehydration.
Feel her gums, too. If she is dehydrated, her gums will feel dry.
At this point, no I don't think so. Give her a few hours to settle down, then offer her some food. If she starts vomiting again, or refuses food for more than 24 hours or is lethargic, then I would take her to your regular vet. But if she just ate some plant leaves and then threw them up, she should be fine.