TOM1,
Has your daughter applied to any other airlines ?.
It is very very hard to get into the airline industry as crew on the first attempt, not just with VS but with most airlines. I'll bet that a majority of cabin crew on here didn't get accepted at their first try, although it does sometimes happen, it is very rare so your daughter should not let this setback worry her.
I applied to just about every UK based airline, and some overseas airlines too when I was 17/18/19, but in the meantime I took a job working on the ground in the airline industry as a customer services agent for Servisair.
It was only after I had begun doing this work that I managed to get my first interview with BY, but that was as far as I got. I then decided that I didn't want to be crew, and 10 years later I'm still working on the ground, but am now a flight dispatcher for a UK based airline run by a man with a beard.
It will not hurt for her to gain some airline experience (although any sort of customer contact based job is an advantage), alot of our customer service staff at VS have just made the move from check-in to crew, so it is very possible to do it that way once you have a foot in the door. There is also less competition to be ground staff, than there is to be crew, so this could be a potential route for her to take, she may even like me change her mind and stay on the ground as there are quite a few differant routes that she could take there too.
Tell her not to be put off, if it's what she really wants to do then she just has to keep on trying, and don't just try VS, try all the other airlines too. Jan/Feb is the best time to try the charter airlines, as this is when they start looking for crew for the summer season.
I wish her the best of luck.