Thank you for the info!

Nothing has been bought yet, she decided to wait until she has some more money so that she doesn't blow all her savings on a bike. Meanwhile I've been looking around (can't help it ) and noticed this 16in Haibike: http://cikloberza.com/show.php?id=82111
It comes with full Deore + XT rear derailleur and Rock Shox Tora SL. At this price (380 EUR, or $500) I think it's a really good deal. It hasn't sold for a couple of months so I think the seller might even agree to knock the price down a bit. I hope it isn't stolen so I definitely think getting the seller to sign a sales contract would be wise if she goes for it.