I would do the transaction with her over the phone in this case.
temporarily set Power Store to no gateway, process the transaction for her, then set it back to using the gateway as normal.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.