A few years ago I was supposed to be at 10 weeks and started having light spotting when I went to the dr and did an u/s it showed a sack measuring at 6 weeks but no heartbeat or anything in the sack a few hours later I completely miscarried while still at the drs office just tell your friend to hang in there this may be a difficult time for her just be there for her
sounds to me like a blighted ovum (gestational sac but no baby), the body sees it as a pregnancy so it continues to produce hormones for a while, the spotting is possibly the start of her miscarrying.