I just let mine run around like slightly insane, mostly small people. That tends to tucker them out well enough.
Also, when not camping, they have a good routine of up at 0600 and to bed my 1930, so sleep tends to come earlier rather than later with them.
Leave her home. 19 months is plenty old enough to fend for herself. Heck, mine had jobs and their own apartment by then.We just got back from a quick overnight camping trip to the Grand Canyon and my 19 month old loves playing at the campsite, laying in the hammock, getting in the roof top tent, but we have the hardest time getting her to go to sleep.