A female doctor who was stuck by her tutor for several years and finally got her degree certificate got so excited that she drank too much and took herself back to three hundred years ago. Then she wanted to do experiments and make technological revolution, but she found that there were always people who wanted to cause sabotage, so she had to ask her fourth brother for help.
(The heroine is not pushy, it's just that she is a science student, and she is a time traveler when she is doing experiments and making inventions. You know she is a fellow traveler, and there are also indigenous time travelers who have changed history in parallel time and space.)