What is Kindred's most reliable build when she mainly has to control the fight edge and cash in on her ultimate?

The most reliable build on Kindred is the one that preserves the first spike while still keeping an escape valve. If your item order prevents you from playing the champion's first real window, the build may look strong on paper but it is not reliable.

When should you truly adapt Kindred's build instead of simply pushing the standard jungle marksman route?

You should adapt as soon as the enemy draft stops you from playing the timing the build was meant to serve. If you need to survive longer, absorb more poke, or answer a specific engage pattern, the purchase order must move before you even think about the final six-slot build.

Which enchant should Kindred choose when the real issue is mainly preserving space before and after Lamb's Respite?

stasis is often the most stable choice because it directly supports this game plan: control tempo through marks and objectives.

Kindred Wild Rift Best Build Guide (Patch 7.2a)

Kindred Wild Rift Best Build Guide

Jungle marksman build for controlled range: Kindred wins when she can play the edge of the fight, punish overextension, then save the decisive tempo moment with her ultimate. The cleaned build must therefore support mobile DPS, terrain access, and reliability of the defensive reset.