that is definitely a new one I haven't heard before, an Oscar laying worms with the eggs so they have something to eat when they hatch. no, this is totally untrue. I strongly suspect that what she is talking about is actually planeria. these could well be flat headed worms that are totally harmless to fish. However, they can look unsightly and thrive in your Aquarium if you overfeed. I would advise her to reduce the feeding for the next couple of weeks. I actually don't know of any medication that is proven to remove planeria successfully without harming other fish. If you search the forums, you will see that a lot of people have had this problem. She may have to remove the worms manually to keep them under control as well as depriving them of food. Just don't do fish and enough to live on and then there won't be much left over for the planeria so they should reduce in numbers, hopefully anyway.
Finally, these sorts of questions belong in the fish section, thank you
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