If you do it through BitPay, or other payment processor, and get it auto converted to fiat (100%), then, from accountants perspective, it makes no difference whatsoever.
Accepting BTC directly creates some extra work for her, which you'll have to pay for, so makes little sense if purchases in BTC are rare and insignificant.
I will definitely check it. Thanks. I saw Coinbase had also solution for merchants but I haven't checked it yet. There should be an option but I was not prioritizing that.