When she was that age, I followed her lead and put her down once she showed sleepy signs. We would do her bedtime routine after dinner (so usually around 6:30 or 7), and by that point she was usually ready to sleep.
Routines can help a lot, and it's never too early to try to start one. It can help your LO realize that it's time to start winding down for the night, and can help them relax. Good luck!