Hi there, this is Dr Linda, a UK based vet.
I'm sorry to hear Bella is so unwell and understand your concern.
I am personally unable to make calls but can continue talking via typing if that is ok.
As her surgery was 3 weeks ago, it is unlikely this is related.
If her symptoms only started after the drawer incident, it is possible they are related as she may have some internal damage.
We would also consider e.g. a gut obstruction, recent toxin ingestion, pancreatitis, viral infection etc.
As it has been over 48 hours, a vet visit is really needed, especially as she is still so young.
We would worry about dehydration and low blood sugar.
The vet will examine Bella and may run some tests such as a blood test and abdominal scan. Treatment will depend on what is going on and may include e.g. an anti nausea injection, assisted feeding and fluids.