Your poor friend must have been beside herself.
All sounds very good now though. I often see on the yellow ladies asking about betas. Its so arbitary. Some donors lead to high early betas and some do not. As well there are early and late implantations, then FETS vs fresh... its a minefield.
I think its better to keep on with the drugs for a few days after the 14 days even if you get a BFN. I know someone close to me got a late beta and he is nearly 8 years old now. You just never know
Its great news about your friend. She must be jumping for joy and rightly so.