Hi again,
I typed a full reply earlier but it all fell through and couldn't post it so I give a short note for now.
The meds were timolol inhibace plus and lithium. Conclusion after the investigation was that timolol eye drops led to early adverse effects and a doctor prescribed the inhibace pus for suspected hypertension. Combined effect of the beta-blockers with lithium caused decreased renal clearance hence the rise in lithium levels to a toxic state.
It was admitted that signs of lithium toxicity were present, some doctors thought Parkinson's as the woman was elderly. Doctor's didn't check lithium levels even though literature gives clear warnings regarding beta-blocker therapy and lithium/toxicity.
Agreed, as you've said lithium would rarely cause tardive disorders within the therapeutic range.
Possibly you would agree, an elderly woman would be safer on an alternative type of medication.
for now