My wife was diagnosed with labrynthitis about 4 weeks ago. Still dizzy. Any suggestions beyond drug?

Testing. Be sure that she has seen an ENT and appropriate testing has been ordered.
Stop taking the meds. If the diagnosis was made by a primary care physician or urgent care and she is taking antivert/meclizine... She should stop the medication which can prolong recovery. If she is continuing to have symptoms, she should see an ENT and get a "balance test" (eng) to confirm the diagnosis. She may also need an mri.