What exactly is a TIA and does this mean that she is at risk of a stroke in the future?
If the TIA was to progress it would result in an ischaemic stroke with biological tissue injury.
On the bright side, there is plenty she can do to substantially reduce her risk of recurrent TIA or indeed, stroke.
This is termed secondary prevention of recurrent TIA and depending on the exact cause of her TIA, typically long term anti-clotting medication and statin (cholesterol-lowering) medication are added.
If your mother drinks alcohol, it is important to only have one drink per day for females and avoid binge drinking.

Ask the doctor: How can my mother avoid having a stroke after suffering a TIA?