The new warmogs that they are playing with on the preseason 5 changes may actually be quite good on her, sure it does give a lot of health, which is bad, but it will give less total than live (800 as opposed to 1000). The main reason it may actually be good is that it will give 3%hp per 5 when out of combat, which is where her health costs hurt the most (since you aren't star calling enemy champions when out of combat). I don't know if these changes will make it good enough to warrant buying so much health, but it is possible. In general though, stacking AP is the best way to counter her health cost since it increases her star call heal more than SV (especially considering that SV basically nullifies its bonus heal by making her heal cost more flat health).