My Salvia seems like she's not doing so well and I was wondering if any more experienced folks on The Nexus might have some advice for me. I'll try to post pictures later, my camera is currently not working.

She's about 2ft fall, with about six full leaves at the very top, and a bunch of smaller, stunted looking leaves protruding from nodes all along the sides.

Both the full leaves and the stunted ones are starting to turn yellow and blacken at the tips, and I haven't seen any new growth happening for about a few weeks now (over the winter, when she was in her greenhouse, she grew very quickly).

She's currently in Massachusetts (with me), outside, in the shade. The average humidity has been 60-80% and the temperature has gone from 60 degrees Fahrenheit at night, to about 80 degrees Fahrenheit during the day, which should be within her acceptable range (maybe a little on the high end).

I recently re-potted her into a larger pot, using potting soil w/ some perlite and sprinkled a handful of worm casting around on top for fertilizer.

Again, I'll try and post pictures later. I've been doing a lot of research, but everything I've found seems contradictory. I mist twice a day, only water when she looks wilted and try and keep her out of direct sunlight, although it was suggested to me that yellowing leaves are a sign of too much sun.

Yellow leaves can be too much sun or lack of nutrients.

Salvia frequently gets browning or curling at the tips this is normal if the leaves are still perky green and healthy its nothing to worry about.

Salvia should recieve almost full time shade, a little sun in the morning or afternoon is fine, but it prefers filtered sunlight.

You might want to try easing in to a fertilizing regimine

How did the rootball look when you took it out of the old pot ?

Sometimes for various reasons the root system (or a large percentage of it) can die on a potted Salvia, so the plant can't take up nutrients and thrive like it should. If the roots looked very thin and brown/black then the plant was most likely to be in a state of distress because of a weak/dying root system.

Sometimes entire batches of potting mix can be what I'd call faulty and not much will grow in it, so I like to make my own mix. Some manufacturers use sludge from millponds that can be outright toxic. It could be you bought some potting mix that wasn't up to scratch.

It may recover in the new soil mix, but it could stay like that and never recover vigour. I've had Salvias in full sun in weather much warmer than that without problems, so it should handle those temps OK if the root system is healthy.

When in doubt, take some cuttings.

My mix for rooted Salvias consists of

1 part screened potting mix - keep the fine stuff and discard the chunks
1 part peat moss - coir can be substituted but I've never found it to be as good
1 part perlite
Mix it all together and mix in some slow release fertiliser at slightly above the recommended rate.
Feed with 1/4 strength miracle grow every few days in mild weather and just water in extreme heat.

This mix can tolerate such a heavy fertilising regime and can be flushed easily to dilute any build up salts from the ferts.

I've moved away from organic mixes and fertilisers in pots because of the root problems it creates, if they are going in the ground then it's worm compost and worm juice all the way.

Edit: pre treated coir is fine, untreated coir creates issues with calcium and magnesium lockup because of the way it binds sodium and displaces other nutrients. Good quality hydroponic grade coir should be fine.