Jane is experiencing loss of balance, impaired fine motor skills, and legal blindness. how many drinks is jane likely to have had?

On average, this effect started to appear if someone's BAC level has reach 0.15 %.

On average, 2 standard drinks could cause an increase in 0.05 % of BAC (depending on each person's body mechanism)

So, it took about 5 drinks for Jane to get into that level of effect.