Pretending to be sick

My 4 year old pretends to be sick (fake coughing, dramatically complaining about certain symptoms that we can tell are not present) to get attention. It’s especially a problem when one of her siblings is sick but she is not. Throws a tantrum when a sibling gets medicine and she does not. We’ve explained that pretending to be sick is dishonest and remind her of times that she was sick and they weren’t and she also got meds when they didn’t. We also are still giving her a normal amount of attention during these times (as in, we are not completely ignoring her as if she doesn’t exist to favor the sick child). Do we do anything about this? My husband thinks we should start issuing some sort of punishment for the lying, but I don’t know what that would look like or if it would be appropriate. Any opinions?