Originally Posted by
Often1
If one of my people even suggested this for themselves, they'd be out the door before they could finish the sentence. I had thought that OP was talking about obtaining a benefit for the employer.
You are assuming she cares about getting the points herself and has a rewards card which would benefit from the purchase.
If answers to the above are no, I wouldn't see a problem with this.
That said, I'd still clear it with your boss.