Oh my god, isn't she fussy??? I totally agree, Salvia is much harder to cultivate than cannabis!
I can offer a few tips from my experiences

1. She loves humidity, absolutely loves it. Favourite place out of all the places I put mine? The bathroom!! Oh man, she loves it there.
2. Don't top her!!! Salvia will naturally develop additional shoots, but those hollow stems do not like to be cut!
3. Don't repot her too much, because she doesn't seem to like that either!
4. She seems to prefer somewhat muted light to direct sunlight - again, bathroom! If you have glass with swirly patterns and stuff in yours, that seems to be perfect for diffusing the light somewhat.
5. Just dry out and smoke the leaves that drop naturally, don't bother harvesting! You will still get the effects and she doesn't like being cut.
Nice spot in a warm-ish bathroom seems to be absolutely ideal. Mine grew to ummm 5ft? and absolutely loved it there
Till the fucking spider mites ate her!