M.G., a frequent flyer is being seen in the ED with a diagnosis of heart failure

M.G., a frequent flyer is being seen in the ED with a diagnosis of heart failure. She was discharged 10 days ago and comes in today stating “I just had to come to the hospital today because I can’t catch my breath and my legs feel big as tree trunks.” After further questioning, you learn that she is strictly following the fluid and salt restriction ordered during her last hospital admission. She reports gaining 1-2lbs every day since her discharge.
What error in teaching most likely occurred when MG was discharged 10 days ago?”
I understand how restricting fluid and salt can help to decrease fluid retention on someone with heart failure. But she is still gaining weight which could mean she is retaining fluid which explains the SOA (can’t catch breath) and heavy legs (possible edema?).
I’m currently in clinical and my instructor is helping other students so I can’t ask her for a while.
Edit: this is just a question on paper. All that I have listed is all I have to go on. Besides meds which are:
ACE inhibitor, thiazolinriones, loop diuretic, and potassium chloride.
The rest of the questions are about medications and what’s good and what’s useless, so to speak

The question implies there’s an issue with patient education.
Here are some possibilities that l learned from previous comments too.
1- what foods containing salt ( Sodium). The patient needs to know that eating her mashed potatoes without salt does not mean she’s not eating too much sodium that will increase the chances for fluid retention.
2- does the patient know what amount of fluids she’s restricted to? Sometimes we as nurses tell the patient
Drink only 1500 ml daily. However, they don’t know what ML is? The patient is not familiar with the metric system as we do. Also some patients will watch their water intake and not the other drinks by the way.
3- was the patient instructed to elevate the lower extremities when in bed ?
All these p