Early pregnancy bleeding

I need answers. My daughter is almost 12 weeks pregnant and the other night had an excessive bleed. Very watery and pinkish and floods of it. She was taken into hospital emergency and examined. the gynacologist thought her waters had broken and she may go into labour. She was transsferred to another hospital for the night for observation and for a scan the morning after. That morning when I saw her she told me that all her sickness had vanished and her emotions were normal (she had suffered immensley throughtout the 11 weeks) We presumed that after having been told that her waters had broken that the baby had died. We went for her scan and to our immense shock were told that the baby was fine and also the amniotic fluid had not leaked. there had been a bleed from here uterine wall opposite from where the placenta was. but why was there so much watery fluid that had escaped leading to the gynacolgist thinking that this was the start of a miscarriage???? The only reason that I can think of was that there was a twin that hadn't formed properly.
We can get no answers.
Can anyone advise
Thank you.
By the way, she is fine now and all her sickness and irrational anxiety has gone!!! She is now 12 weeks pregnant