Elizabeth is defined as “Philosophical” and “Financial”. This means you will have a bonus of Great People appearance (+100% birth rate). However, doubling zero is still zero – so you should either build wonders or create specialists in your cities. Universities (that speed up your research by 25%) are built with double speed, so discovering Education and building Libraries (required for University) is very logical.
“Financial” should make you research “Banking” as soon as possible, as the Banks are constructed at double speed. As you will probably have many banks it will bring you closer to the Wall Street wonder. Also, you should concentrate on terrains which produce more commerce, as you have a bonus of +1 for each square that generates 2.