Drama! Horses flopping down? Not something I've ever seen/heard of here!
It might be different where you are, but here we have 20k social rides and 40k training rides. You can take a reasonably fit horse into either without too much preparation. Heck, as you know, I did a 20k on my barely broken unfit Latte! I think Lacey would knock down a 20k or 40k with no worries.
We don't have CTR where I am, but it sounds great, and do agree that it would be a good starting point!
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20k... About 10 miles? Lacey could certainly handle that. 40k... About 20 miles? No problem, as long as she stays hydrated. "Serious" endurance is the only thing I wouldn't recommend.