I have received Best Offers higher than the starting price, but usually the buyer will ask for extra terms such as free shipping (or shipping included for that total) or they make an offer on 1 listing but actually request to purchase items from another listing included in that offer price (this is super frustrating, imo).
I would suggest your friend message the buyer to be sure they don't have any special terms they want included in that price before she accepts. While eBay gives a place to type in additional terms, it's possible the buyer has something in mind but didn't type it out for some reason.