Jaydorn has some solid advice. Personally, I'd avoid getting a business/GST number at this point given its a two week job only. That business number is permanent and will follow around the business. Not that that is necessarily a bad thing, but getting a permanent number for 2 weeks seems excessive.
I think the best way to convince the company she doesn't need a GST number is to invoice them with GST clearly being shown as zero. So the invoice looks like this:
Service: $100
GST: $0
Total: $100
That way it is clear to both parties that there is no GST to be charged and as such a GST number is not required. That covers the company as they will have the invoice to prove they shouldn't have paid GST based on the invoice if the CRA ever comes knocking (which is extremely unlikely). If there was no GST line on the invoice showing zero it become more ambiguous, which I'm guessing is what the company wants to avoid.
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