I am sorry OP, but none of that sounds convincing to me. I worked on and FE/HE campus for donkeys years, lots of 16, 17 year olds sharing a residential campus with HE students! I took my turn in 'warden' duties, so know quite a bit about some of the usual sanctions.
How long has she been suspended for?
What does the suspension letter say?
Does it outline any further sanctions or include anything she must do before returning?
Alcohol, breakages etc will all have set punishments, from payment to X days suspension and apologies and behaviour contracts. So your DD will have more information about this. I too doubt that this is a single instance, though it is a bad one... party, alcohol, theft and damages!
As she has been suspended not expelled then her belongings would not have been thrown out as she would have been expected to return after her suspension was over. However, had it been drugs she may well have been instantly expelled. Many universities have an absolute zero tolerance for drugs, so do check!
Sorry, but I think you may need to do a bit more digging into what happened before you go to bat for her!