We don’t know how she won but we can work out how much she won.
Let $W be her winnings, then she spent ⅘W on a house, leaving ⅕W.
She spent ¾(⅕W)=3W/20 on a yacht, leaving ¼(⅕W)=W/20. She spent ⅔W/20=W/30 on her space trip, leaving ⅓W/20=W/60=50000.
So she won 60×50000=$3,000,000 ($3M).