It depends a lot on whose size zero she is wearing. At the mainstream mall stores, I can sometimes squeese into a 0/2 as a size 28/29 and there's no way I could ever get myself into a 24. A 24 is waay smaller than, for instance, an Old Navy 0 IMO.
If she's wearing higher end, smaller cut 0s and finding that many 0s are still too big, then we're talking 23/24 type territory.
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