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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
It is always concerning when a pet possibly eats something that they shouldn't. How much concern we should have is entirely dependent on how much they ate, how big of a piece they swallowed. Often there is no way to know this. The still wool is obviously not digestible and it shouldn't be toxic (unless it is one that has cleaning solutions in it). I think that starting her on something like hairball remedy to keep things moving though her intestines is a good place to start. Probably the most important thing to do is to monitor her closely. The first sign of abdominal pain, distention or vomiting warrants a trip to the veterinarian for an xray. Steel wool should show up so you can tell how much she ate and if it looks like a large enough piece to cause a problem.
Just don't wait if you see any problems, delaying treatment if becomes stuck or happens to cause damage to the bowel can be life threatening.
Best wishes. If you have more questions please let me know If not, please don't forget to rate my answer.