I've travelled a lot in all the countries you mention - sometimes alone, when I was a young woman.
My best advice - use common sense, listen to your gut instinct, and don't get too drunk or take drugs.
Don't carry around too much cash at any one time - there's no need to in this day and age. Get one of those pre-paid travel cards which don't charge you to withdraw money, and only carry a small amount of cash, My rule of thumb was - if my bag got stolen, can I afford to lose the cash that is in it? If the answer was no - I was carrying too much cash. It's worth paying a quid or so to withdraw cash/use a card if it means your money is safe.
I had my bag nicked twice - once was in a hostel in Australia where I went to cook dinner and couldn't be bothered carrying my handbag around the kitchen with me. I trusted my fellow travellers. Big mistake. The other time was at Cairns airport, arrived, was faffing about with bags at the taxi rank - handbag was nicked. The lesson - get a small handbag and carry it everywhere.
Take a photo/scan of her passport and cards, and keep a copy, but get her to email it to herself too so that she has access to it if her bag is stolen.
As for personal safety - trust your gut. Don't get into situations with strangers that you can't get out of. Don't feel obliged to go along with someones offer of a place to stay/a lift/a free tour... stick with other travellers, and if it feels wrong, say no. If sh'es going on a trip where she's out of range for a few days - make sure she tells someone (you) where she's going beforehand, who with etc.
Most of the horror stories we hear about travellers getting into trouble unfortunately involve drugs or alcohol. So just tell her to keep her wits about her.
Don't pre-arrange a time to contact each other - it will only make you worry yourself sick if she forgets or can't get in touch for some reason. In this day and age with instant messaging constantly available, you should be able to text her frequently.