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What you're looking for are leather suspension cuffs.
Suspension, even partial suspension by the wrists is very stressful. This is especially true for women because of their reduced musculature.
Read up on suspension ties and get a panic snap or two.
You can use rope for this but you should still attach it to a panic snap to get her down quickly (but PLEASE, not too quickly... you'll really hurt her) if the need arises.
The rope you would need would have to be at least 1/4" and would need to be doubled and wrapped twice so a single rope isn't cutting into her wrist or compressing any nerves. I would use braided nylon. It's soft and gives a little.
Again, learn about ties and suspension before doing this. There is info in the beginners FAQ on this kind of safety.
... and try hanging this way yourself for the amount of time you want to keep her suspended so that you have a point of reference.
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