Hello Anders,
I have got to be honest and let you know what my feelings are regarding your situation, obviously not knowing any thing about you or your relationship with your daughter makes it a little more difficult.
I personaly would try all of her known friends and the places she frequents etc , to try and find her, and if you are succesful try and get to the root of the problem, nobody for no reason suddenly starts stealing , and I have got to say that imho that I suspect your daughter has lost her way a little and "I,m sorry to have to say it" and is more than likely to be using some form of drugs. I know this is a harsh anaylasis but it does seem to point to this. I speak from personal experience ," not my own children I might add" but somebody very close and they will literaly take any thing from any one , even their own parents.
I would try to arrange some form of repayment to those custys, and would certainly pull out all the stops to try and gat some help for your daughter, shouting and bawling, arguments and rows will not help matters, a caring and long thoughtful few months are ahead.
This is of course only an assuption, and I do hope I am wrong, and you have my sympathy all the way .
good luck ,and i hope you soon find your daughter, your mind must be in bits.
geoff