If your friend has a National made rotary machine, then she'll have one that fits. National and White both use a center needle, but White has a bit more distance between the presser bar and needle bar. Standard has an offset needle hole and Free has a narrower top clamp so these would fit very loose. There are a lot more options for older sets of top clamp attachments, but this is a later set when most of the other companies were out of business. Greist was making most of the top clamp accessories at that time.
I've got way, way more attachments than I have machines for, and I've got over 150 of them! And even though I really don't need anything more, I still get tempted when I see something I don't have lol!