you ever seen Shield of the Oversoul? in your case it gives +2/+2 and indestructible. (meaning your creature can never die. They cant edict, target, or wrath your general.) Also, Indestructibility might be up your alley.

To be honest I would focus on making her indestructible and then go from there. There is nothing worse then staring at a hexproof AND indestructible creature.

Yeah it's been suggested in my first update, and I will probably have to find one somewhere (started playing in besieged)

personally in my Bruna, Light of Alabaster deck I like Steel of the Godhead more but meh. Damn edh and it's restrictive colors.

With so few non permanents you could also try Primal Surge or Genesis Wave to get some quick board presence.