I think you need to re-do the alone training. Spend a weekend, coming-and-going (actually leaving the property, not just standing outside the door).
Leave, walk around the block, come back in... do it again.... and again. You said you thought she responded to the alone training when you first got her, so maybe with some more she will learn how to be alone. If she doesn't like he crate, don't put her in it (assuming she does not destroy stuff in the house)
It's sad that she seems to be stressed even with other people around (not necessarily just when she is at home, alone). I hope some more alone-training, and hence, more time away from you each day might help her ease into this new world... hate to see them so stressed.