Reduce her ultimate damage from 5000 over 5 seconds to 2500 over 5 seconds. Thus, it will make healers useful and reduce her "oneshot" problem. Healing would be her effective way for counter play.
OR keep it as it's now but make it non-hittable through walls. Like this would make Barik Barricade, Fernando Shield and Makoa Shield useful vs her ultimate while making Skye useless in this part at some point.