You should understand that your mother ha Diabetes and symptoms she had now if she has recovered completely has suffered TIA(Transient Ischemic Attack
) of some kind hope fully a CT Scan /MRI Angiography must have been done if not it must be done to know extent of brain damage. Enlarged heart
indicate heart failure
that is ejection fraction
which must be low such patient can have clot in heart which could cause Stroke.
Keep diabetes under tight control,same for Blood pressure,Lipid profile if deranged. Decrease salt intake walking regularly helps a lot.
She must be investigated for blocks in major neck arteries,called carotids by Doppler study.SHE MUST TAKE MEDICINES REGULARLY.
Please take care of your mother and do not worry.
Best of health to her.