each vial has 10 doses, but that's not even relevant. they found 100g of powder and I just read somewhere that powder carries a heavier punishment than in liquid form...its bad enough being liquid because we all think 1 vial would count once against you...not the case. one vial has 10cc in it, so you can see how they can sensationalize a small stash.
If I was a cop, I'd paint you as a dealer, obviously going to make about 50 vials, which count for 10 each, so that's 500 points against you if you think like this. They have receipts which will prove it was mailed to you, crossing state lines, federal. mail fraud previously gave the feds the right to take all your assets, but since you have none, I doubt they will do anything with that. but conspiracy holds a 5 year penalty..they have most of the world convicted of conspiracy because they need no proof...its a crappy system.
My biggest beef with this entire scenario is the breach of trust with your mother. When you have a record for the rest of your life, because she decided to snoop on you, you can thank her. I don't think I'd ever forgive such a betrayal. I wish there was a punishment for her crime. I'd like to know how she thought she was going to help you by doing this..Its terrible.