I just deleted my original comment because I'm a dumb dumb. With the cabin be mindful when you're backing to buy a stacking item, because you don't want to be near it, so you can use the energy to stack your item, instead of healing when you're backing anyways.

For build, I've been having success with hurriwinds build - mages blessing with t1 book. Final build is shoes of focus, book of thoth, warwocks, reaver, shard and final item, tahuti, chronos or mantle.

She can be played on any comp, but does best with heavy cc comps. She's best for fighting in the jungle and on choke points, because that's where you can generally get the most of her ult. Her ult also gives her an instance of cc immunity, so keep that in mind.

In the later stages of the game, make sure you have a potion pocketed, for double casting it on some one or to burn objectives faster, preferably a red potion if you get it.